@book{120604,
	author = {Fromm, Erich, and Fromm, Erich,},
	title = {?Tener o ser?},
	publisher = {Fondo de Cultura Económica},
	year = {1987.},
	address = {México, D.F.},
	edition = {1a ed. en español.},
	note = {Translation of: To have or to be.}
}