@inproceedings{CHI-PLAY-2017-TondelloMN,
	author        = "Gustavo Fortes Tondello and Alberto Mora and Lennart E. Nacke",
	booktitle     = "{Proceedings of the Fourth Annual Symposium on Computer-Human Interaction in Play}",
	doi           = "10.1145/3116595.3116627",
	ee            = "https://www.wikidata.org/entity/Q61971804",
	isbn          = "978-1-4503-4898-0",
	pages         = "129--142",
	publisher     = "{ACM}",
	title         = "{Elements of Gameful Design Emerging from User Preferences}",
	year          = 2017,
}