S. Deterding, S. Björk, L. Nacke, D. Dixon, und E. Lawley. Proceedings of the SIGCHI Conference Extended Abstracts on Human Factors in Computing Systems (CHI EA '13), Paris, France, Seite 3263--3266. New York, ACM, (2013)
S. Deterding, M. Sicart, L. Nacke, K. O'Hara, und D. Dixon. Proceedings of the SIGCHI Conference Extended Abstracts on Human Factors in Computing Systems (CHI EA '11), Vancouver, Canada, Seite 2425--2428. New York, ACM, (2011)