Homo Ludens: A Study of the Play-element in Culture. Huizinga, J. H. Beacon Press, 1950. Google-Books-ID: r6OdzQEACAAJ
bibtex   
@book{huizinga_homo_1950,
	title = {Homo {Ludens}: {A} {Study} of the {Play}-element in {Culture}},
	shorttitle = {Homo {Ludens}},
	language = {en},
	publisher = {Beacon Press},
	author = {Huizinga, Johan H.},
	year = {1950},
	note = {Google-Books-ID: r6OdzQEACAAJ},
}

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