diff --git a/README.md b/README.md
index 54a4105..6d8acb8 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,11 @@
 # Java Interviews
 
 A collection of interview questions implemented in Java
+
+# References
+
+Superando a Entrevista de Programação
+https://www.patreon.com/posts/60674808
+
+Understanding time complexity with Python examples
+https://towardsdatascience.com/understanding-time-complexity-with-python-examples-2bda6e8158a7
\ No newline at end of file