diff --git a/README.md b/README.md
index 1962ddb..42656e1 100644
--- a/README.md
+++ b/README.md
@@ -228,6 +228,7 @@ Please see [CONTRIBUTING](CONTRIBUTING.md) for details and contribute. ;)
 *Fantastic and must-read books about object-oriented programming, analysis, design and related concepts.*
 
 * [PHP Objects, Patterns, and Practices](http://books.google.com/books?id=1JkQAwAAQBAJ&hl=pt-BR&source=gbs_book_other_versions)
+* [Object-Oriented PHP ($)](https://leanpub.com/object-orientedphp/) - OOP design, principles and techniques using PHP 7
 * [Head First Design Patterns](http://books.google.com/books/about/Head_First_Design_Patterns.html?id=LjJcCnNf92kC&redir_esc=y)
 * [Design Patterns: Elements of Reusable Object-Oriented Software](http://books.google.com/books/about/Design_Patterns.html?id=6oHuKQe3TjQC&redir_esc=y)
 * [Head First Object-Oriented Analysis and Design](http://books.google.com/books/about/Head_First_Object_Oriented_Analysis_and.html?id=-QpmamSKl_EC&redir_esc=y)