@inproceedings{DiGRA-2011-WarmelinkS,
	author        = "Harald Warmelink and Marko Siitonen",
	booktitle     = "{Proceedings of the Sixth DiGRA International Conference: Think, Design, Play}",
	ee            = "http://www.digra.org/digital-library/publications/player-communities-in-multiplayer-online-games-a-systematic-review-of-empirical-research/",
	publisher     = "{Digital Games Research Association}",
	title         = "{Player Communities in Multiplayer Online Games: A Systematic Review of Empirical Research}",
	year          = 2011,
}