@inproceedings{FDG-2014-SiuZR,
	author        = "Kristin Siu and Alexander Zook and Mark O. Riedl",
	booktitle     = "{Proceedings of the Ninth International Conference on the Foundations of Digital Games}",
	ee            = "http://www.fdg2014.org/papers/fdg2014_paper_28.pdf",
	isbn          = "978-0-9913982-2-5",
	publisher     = "{Society for the Advancement of the Science of Digital Games}",
	title         = "{Collaboration versus competition: Design and evaluation of mechanics for games with a purpose}",
	year          = 2014,
}