APA Citation
Friedl, M. (2003). Online game interactivity theory. Hingham, Mass.: Charles River Media, Inc..
Chicago Style CitationFriedl, Markus. Online Game Interactivity Theory. Hingham, Mass.: Charles River Media, Inc., 2003.
MLA CitationFriedl, Markus. Online Game Interactivity Theory. Hingham, Mass.: Charles River Media, Inc., 2003.
Warning: These citations may not always be 100% accurate.