+ * Karl Popper: Logik der Forschung.
+ * Michael E. Gerber: The E-Myth Revisited. HarperCollins 1995, ISBN-13: 978-0887307287
+ * more “Discworld” novels by Terry Prattchet (R.I.P.), in English or German
+ * already got “Mort”, “Guards! Guards!”, “The Color of Magic”, “The Light Fantastic”, “Hogfather”
+ * based on that, refer to the [Discworld Reading Order Guides](http://www.lspace.org/books/reading-order-guides/) for your optimal choice
+ * Jon Loeliger: Versionskontrolle mit Git, O'Reilly Verlag, Köln 2010. ISBN-13: 978-3897219458 (or in English: ISBN-13: 978-0596520120)
+ * Anything written by Donald E. Knuth (in English please). For the long term, “The Art of Computer Programming” would be nice to have.
+ * Already got “The Art of Computer Programming”, Volume 1.
+ * John Napier: Hands. Princeton University Press, 1993. ISBN-13: 978-0691025476
+ * Jeffrey Friedl: Mastering Regular Expressions. O'Reilly 1997, ISBN 1-56592-257-3