Books
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+ * Till Roenneberg: Wie wir ticken. Die Bedeutung der Chronobiologie für uns, ISBN-13: 978-3832161880 (or in English: Internal Time. Chronotypes, Social Jet Lag and Why You're So Tired, ISBN-13: 978-0674065857)
* 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