@inproceedings{DiGRA-2007-LinS,
	author        = "Holin Lin and Chuen-Tsai Sun",
	booktitle     = "{Proceedings of the Fourth DiGRA International Conference: Situated Play}",
	ee            = "http://www.digra.org/digital-library/publications/cash-trade-within-the-magic-circle-free-to-play-game-challenges-and-massively-multiplayer-online-game-player-responses/",
	publisher     = "{Digital Games Research Association}",
	title         = "{Cash Trade Within the Magic Circle: Free-to-Play Game Challenges and Massively Multiplayer Online Game Player Responses}",
	year          = 2007,
}