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  Valve: Team Fortress 2 is free forever | Game Development | News by Develop

  https://web.archive.org/web/20110627082805/http://www.develop-online.net/news/38103/Team-Fortress-2-becomes-free-forever

  Triple-A becomes free-to-play, but Valve may not push the model to other blockbusters

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  Misinformation about D’Onofrio et al. (2014): Paternal age and offspring problems: Misinformation about the findings of “Paternal Age at Childbearing and Offspring Psychiatric and Academic Morbidity,” a study by D’Onofrio et al. (2014)

  http://herman-research.blogspot.de/2014/03/misinformation-about-findings-of.html

  Keine Beschreibung vorhanden.

• 

  On The Vocabulary of Role-Playing

  http://kunst.erzwiss.uni-hamburg.de/Tan/Homepage/Rollenspiel/vocabulary.html

  Notes on the Vocabulary of Role-Playing Games

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  Spitfire Marks

  https://web.archive.org/web/20080902054107/http://www.spitfiresociety.demon.co.uk/whatmark.htm

  Keine Beschreibung vorhanden.

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