* Gamma, Helm, Johnson, Vlissides: Design Patterns. Elements of Reusable Object-Oriented Software. Addison-Wesley 1994, ISBN-13 978-0201633610
* Bryan Lee O'Malley: Scott Pilgrim (for example, [this](http://www.amazon.de/Scott-Pilgrim-Boxed-Set-Poster/dp/1934964573/?tag=aflattrcom506-21) 6 Volume Set)
* Jeffrey Friedl: Mastering Regular Expressions. O'Reilly 1997, ISBN 1-56592-257-3
* Gamma, Helm, Johnson, Vlissides: Design Patterns. Elements of Reusable Object-Oriented Software. Addison-Wesley 1994, ISBN-13 978-0201633610
* Bryan Lee O'Malley: Scott Pilgrim (for example, [this](http://www.amazon.de/Scott-Pilgrim-Boxed-Set-Poster/dp/1934964573/?tag=aflattrcom506-21) 6 Volume Set)
* Jeffrey Friedl: Mastering Regular Expressions. O'Reilly 1997, ISBN 1-56592-257-3