http://support7.qnx.com/download/download/26211/Qt_Development_Environment.pdf
http://www.arxen.com/descargas/Books/Mastering%20Qt%205%20-%20Guillaume%20Lazar,%20Robin%20Penea.pdf
http://ptgmedia.pearsoncmg.com/images/9780131879058/downloads/0131879057_Ezust_book.pdf