@inproceedings{DiGRA-2003-SalenZ,
	author        = "Katie Salen and Eric Zimmerman",
	booktitle     = "{Proceedings of the Second Digital Games Research Conference: Level Up}",
	ee            = "http://www.digra.org/digital-library/publications/this-is-not-a-game-play-in-cultural-environments/",
	title         = "{This is not a game: play in cultural environments}",
	year          = 2003,
}