diff --git a/src/main/java/com/epam/izh/rd/online/entity/Author.java b/src/main/java/com/epam/izh/rd/online/entity/Author.java
index 166be587..f5ca4a81 100644
--- a/src/main/java/com/epam/izh/rd/online/entity/Author.java
+++ b/src/main/java/com/epam/izh/rd/online/entity/Author.java
@@ -19,5 +19,73 @@
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
 public class Author {
+    private String name;
+    private String lastName;
+    private LocalDate birthdate;
+    private String country;
 
+    public Author() {
+    }
+
+    public Author(String name, String lastName, LocalDate birthdate, String country) {
+        this.name = name;
+        this.lastName = lastName;
+        this.birthdate = birthdate;
+        this.country = country;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public LocalDate getBirthdate() {
+        return birthdate;
+    }
+
+    public void setBirthdate(LocalDate birthdate) {
+        this.birthdate = birthdate;
+    }
+
+    public String getCountry() {
+        return country;
+    }
+
+    public void setCountry(String country) {
+        this.country = country;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Author author = (Author) o;
+        return name.equals(author.name) && lastName.equals(author.lastName) && birthdate.equals(author.birthdate) && country.equals(author.country);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name, lastName, birthdate, country);
+    }
+
+    @Override
+    public String toString() {
+        return "Author{" +
+                "name='" + name + '\'' +
+                ", lastName='" + lastName + '\'' +
+                ", birthdate=" + birthdate +
+                ", country='" + country + '\'' +
+                '}';
+    }
 }
diff --git a/src/main/java/com/epam/izh/rd/online/entity/Book.java b/src/main/java/com/epam/izh/rd/online/entity/Book.java
index 08bdccb8..546ef3b4 100644
--- a/src/main/java/com/epam/izh/rd/online/entity/Book.java
+++ b/src/main/java/com/epam/izh/rd/online/entity/Book.java
@@ -16,5 +16,51 @@
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
 public abstract class Book {
+    private int numberOfPages;
+    private String name;
 
+    public Book() {
+    }
+
+    public Book(int numberOfPages, String name) {
+        this.numberOfPages = numberOfPages;
+        this.name = name;
+    }
+
+    public int getNumberOfPages() {
+        return numberOfPages;
+    }
+
+    public void setNumberOfPages(int numberOfPages) {
+        this.numberOfPages = numberOfPages;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Book book = (Book) o;
+        return numberOfPages == book.numberOfPages && name.equals(book.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(numberOfPages, name);
+    }
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "numberOfPages=" + numberOfPages +
+                ", name='" + name + '\'' +
+                '}';
+    }
 }
diff --git a/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java b/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java
index a9834db4..61aad122 100644
--- a/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java
+++ b/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java
@@ -20,5 +20,64 @@
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
 public class SchoolBook extends Book {
+    private String authorName;
+    private String authorLastName;
+    private LocalDate publishDate;
 
+    public SchoolBook() {
+    }
+
+    public SchoolBook(int numberOfPages, String name, String authorName, String authorLastName, LocalDate publishDate) {
+        super(numberOfPages, name);
+        this.authorName = authorName;
+        this.authorLastName = authorLastName;
+        this.publishDate = publishDate;
+    }
+
+    public String getAuthorName() {
+        return authorName;
+    }
+
+    public void setAuthorName(String authorName) {
+        this.authorName = authorName;
+    }
+
+    public String getAuthorLastName() {
+        return authorLastName;
+    }
+
+    public void setAuthorLastName(String authorLastName) {
+        this.authorLastName = authorLastName;
+    }
+
+    public LocalDate getPublishDate() {
+        return publishDate;
+    }
+
+    public void setPublishDate(LocalDate publishDate) {
+        this.publishDate = publishDate;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        if (!super.equals(o)) return false;
+        SchoolBook that = (SchoolBook) o;
+        return authorName.equals(that.authorName) && authorLastName.equals(that.authorLastName) && publishDate.equals(that.publishDate);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), authorName, authorLastName, publishDate);
+    }
+
+    @Override
+    public String toString() {
+        return "SchoolBook{" +
+                "authorName='" + authorName + '\'' +
+                ", authorLastName='" + authorLastName + '\'' +
+                ", publishDate=" + publishDate +
+                '}';
+    }
 }
diff --git a/src/main/java/com/epam/izh/rd/online/repository/SimpleAuthorRepository.java b/src/main/java/com/epam/izh/rd/online/repository/SimpleAuthorRepository.java
new file mode 100644
index 00000000..ca4729b9
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/repository/SimpleAuthorRepository.java
@@ -0,0 +1,54 @@
+package com.epam.izh.rd.online.repository;
+
+import com.epam.izh.rd.online.entity.Author;
+
+import java.util.Arrays;
+
+public class SimpleAuthorRepository implements AuthorRepository{
+    private Author[] authors = new Author[0];
+    @Override
+    public boolean save(Author author) {
+        if (findByFullName(author.getName(), author.getLastName()) != null){
+            return false;
+        } else {
+            Author[] authorsBuffer = new Author[authors.length + 1];
+            System.arraycopy(authors,0,authorsBuffer,0,authors.length);
+            authorsBuffer[authors.length] = author;
+            authors = authorsBuffer;
+            return true;
+        }
+    }
+
+    @Override
+    public Author findByFullName(String name, String lastname) {
+        for (Author author: authors) {
+            if (author.getName().equals(name) && author.getLastName().equals(lastname)){
+                return author;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public boolean remove(Author author) {
+        if (findByFullName(author.getName(), author.getLastName()) != null){
+            Author[] authorsBuffer = new Author[authors.length - 1];
+            for (int i = 0, authorCount = 0; i < authors.length; i++, authorCount++) {
+                if (authors[i].getName().equals(author.getName()) && authors[i].getLastName().equals(author.getLastName())) {
+                    authorCount--;
+                    continue;
+                }
+                authorsBuffer[authorCount] = authors[i];
+            }
+            authors = authorsBuffer;
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public int count() {
+        return authors.length;
+    }
+}
diff --git a/src/main/java/com/epam/izh/rd/online/repository/SimpleSchoolBookRepository.java b/src/main/java/com/epam/izh/rd/online/repository/SimpleSchoolBookRepository.java
new file mode 100644
index 00000000..9c50698c
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/repository/SimpleSchoolBookRepository.java
@@ -0,0 +1,74 @@
+package com.epam.izh.rd.online.repository;
+
+import com.epam.izh.rd.online.entity.Book;
+import com.epam.izh.rd.online.entity.SchoolBook;
+
+import java.util.Arrays;
+
+public class SimpleSchoolBookRepository implements BookRepository<SchoolBook>{
+    private SchoolBook[] schoolBooks = new SchoolBook[]{};
+
+
+    @Override
+    public boolean save(SchoolBook book) {
+        SchoolBook[] schoolBooksBuffer = new SchoolBook[schoolBooks.length + 1];
+        System.arraycopy(schoolBooks, 0, schoolBooksBuffer, 0, schoolBooks.length);
+        schoolBooksBuffer[schoolBooks.length] = (SchoolBook) book;
+        schoolBooks = schoolBooksBuffer;
+        return true;
+    }
+
+    @Override
+    public SchoolBook[] findByName(String name) {
+        SchoolBook[] results;
+        int bookCount = 0;
+        for (SchoolBook book : schoolBooks) {
+            if (book.getName().equals(name)) {
+                bookCount++;
+            }
+        }
+        results = new SchoolBook[bookCount];
+        if (bookCount == 0) {
+            return results;
+        }
+        bookCount = 0;
+        for (SchoolBook book : schoolBooks) {
+            if (book.getName().equals(name)) {
+                results[bookCount] = book;
+                bookCount++;
+            }
+        }
+        return results;
+    }
+
+    @Override
+    public boolean removeByName(String name) {
+        if (findByName(name).length == 0) {
+            return false;
+        }
+        int counter = 0;
+        for (int i = 0; i < schoolBooks.length; i++) {
+            if (schoolBooks[i].getName().equals(name)) {
+                schoolBooks[i] = null;
+                counter++;
+            }
+        }
+        SchoolBook[] schoolBooksBuffer = new SchoolBook[schoolBooks.length - counter];
+        counter = 0;
+        for (int i = 0; i < schoolBooks.length; i++) {
+            if (schoolBooks[i] != null) {
+                schoolBooksBuffer[counter] = schoolBooks[i];
+                counter++;
+            }
+        }
+        schoolBooks = schoolBooksBuffer;
+        return true;
+    }
+
+    @Override
+    public int count() {
+        return schoolBooks.length;
+    }
+}
+
+
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleAuthorService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleAuthorService.java
new file mode 100644
index 00000000..6915f011
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleAuthorService.java
@@ -0,0 +1,35 @@
+package com.epam.izh.rd.online.service;
+
+import com.epam.izh.rd.online.entity.Author;
+import com.epam.izh.rd.online.repository.AuthorRepository;
+
+public class SimpleAuthorService implements AuthorService{
+    private AuthorRepository authorRepository;
+
+    public SimpleAuthorService() {
+    }
+
+    public SimpleAuthorService(AuthorRepository authorRepository) {
+        this.authorRepository = authorRepository;
+    }
+
+    @Override
+    public boolean save(Author author) {
+        return authorRepository.save(author);
+    }
+
+    @Override
+    public Author findByFullName(String name, String lastname) {
+        return authorRepository.findByFullName(name, lastname);
+    }
+
+    @Override
+    public boolean remove(Author author) {
+        return authorRepository.remove(author);
+    }
+
+    @Override
+    public int count() {
+        return authorRepository.count();
+    }
+}
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleSchoolBookService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleSchoolBookService.java
new file mode 100644
index 00000000..bd6cfe24
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleSchoolBookService.java
@@ -0,0 +1,62 @@
+package com.epam.izh.rd.online.service;
+
+import com.epam.izh.rd.online.entity.Author;
+import com.epam.izh.rd.online.entity.SchoolBook;
+import com.epam.izh.rd.online.repository.BookRepository;
+
+public class SimpleSchoolBookService implements BookService<SchoolBook> {
+    private BookRepository<SchoolBook> schoolBookBookRepository;
+    private AuthorService authorService;
+
+    public SimpleSchoolBookService() {
+    }
+
+    public SimpleSchoolBookService(BookRepository<SchoolBook> schoolBookBookRepository, AuthorService authorService) {
+        this.schoolBookBookRepository = schoolBookBookRepository;
+        this.authorService = authorService;
+    }
+
+    @Override
+    public boolean save(SchoolBook book) {
+        if (authorService.findByFullName(book.getAuthorName(), book.getAuthorLastName()) != null) {
+            schoolBookBookRepository.save(book);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public SchoolBook[] findByName(String name) {
+        return schoolBookBookRepository.findByName(name);
+    }
+
+    @Override
+    public int getNumberOfBooksByName(String name) {
+        return schoolBookBookRepository.findByName(name).length;
+    }
+
+    @Override
+    public boolean removeByName(String name) {
+        return schoolBookBookRepository.removeByName(name);
+    }
+
+    @Override
+    public int count() {
+        return schoolBookBookRepository.count();
+    }
+
+    @Override
+    public Author findAuthorByBookName(String name) {
+
+        SchoolBook[] byName = schoolBookBookRepository.findByName(name);
+        if (byName.length == 0) {
+            return null;
+        }
+        String authorName = byName[0].getAuthorName();
+        String authorLastName = byName[0].getAuthorLastName();
+
+        return authorService.findByFullName(authorName, authorLastName);
+
+    }
+}