@article {541821,
	title = {A Playful Game Changer: Fostering Student Retention in Online Education with Social Gamification},
	journal = {Proceedings of the Second (2015) ACM Conference on Learning @ Scale},
	year = {2015},
	pages = {95-102},
	url = {http://dl.acm.org/citation.cfm?id=2724665},
	author = {Krause, M. and Mogale, M. and Pohl, H. and Williams, J.J.}
}
