1. Software Association. Essential facts about the computer and video game industry, 2006. A digital copy can be downloaded at http://www.theesa.com/archives/files/Essential%20Facts%202006.pdf
2. Industry transformed as one-third of games software revenues will be games generated online by 2011. Strategy Analytics, September 2007. Available online at http://www.strategyanalytics.net/default.aspx?mod=PressReleaseViewer&a0=3569
3. . Keeping bots out of online games. ACM SIGCHI International Conference on Advances in Computer Entertainment Technology; 2005 June 15–17, Valencia, Spain.
4. Ogre to Slay? Outsource it to Chinese. D. Barobza, New York Times, 5 December 2005. Available online at http://www.nytimes.com/2005/12/09/technology/09gaming.html?ex=1291784400&en=a723d0f8592dff2e&ei=5090&partner=rssuserland&emc=rss
5. . A systematic classification of cheating in online games. NetGames 05, October 10–11, 2005, Hawthorne, New York, USA, ACM, pp. 1–9.