Gameplay
Korhonen, H., & Koivisto, E. M. I. (2006). Playability heuristics for mobile games. In Proceedings of the 8th Conference on Human-Computer interaction with Mobile Devices and Services (Helsinki, Finland, September 12–15, 2006). MobileHCI '06, vol. 159. ACM, New York, NY, 9-16. doi: 10.1145/1152215.1152218