@inbook {468,
	title = {Proun Room, Great Berlin Art Exhibition},
	booktitle = {S. Lissitzky-Kuppers, El Lissitzky: Life. Letters. Texts},
	year = {1968},
	publisher = {Thames and Hudson},
	organization = {Thames and Hudson},
	address = {Londres},
	author = {Lissitzky, El}
}
