@inproceedings{CHI-2013-Denny,
	author        = "Paul Denny",
	booktitle     = "{Proceedings of the 31st ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/2470654.2470763",
	isbn          = "978-1-4503-1899-0",
	pages         = "763--772",
	publisher     = "{ACM}",
	title         = "{The effect of virtual achievements on student engagement}",
	year          = 2013,
}