@book{123975,
	author = {Simmel, Georg,},
	title = {Problemas fundamentales de la filosofía},
	publisher = {UTEHA},
	year = {1961.},
	series = {Manuales UTEHA, no. 62. Sección 7: Filosofía.},
	address = {México},
	note = {Translation of Hauptprobleme der philosophie.}
}