@book{647,
	author = {Graaf, Reinier de},
	title = {Users Engagement},
	publisher = {UrbanNext,},
	year = {October 7, 2016.},
	note = {expanding design practices, No Density, Reinier de Graaf, Talk, Technology and fabrication},
	url = {https://urbannext.ovh/users-engagement/}
}