Chapter 20: Artificial Life and Puzzle Games, [w:] AndrewA.RollingsAndrewA., ErnestE.AdamsErnestE., Fundamentals of game design, Upper Saddle River, N.J.: Pearson Prentice Hall, 2007, ISBN 978-0-13-168747-9, OCLC70676558. Brak numerów stron w książce
