@book{35087,
	author = {Schmidt, Alfred and Marx, Karl,},
	title = {El concepto de naturaleza en Marx},
	publisher = {Siglo veintiuno editores},
	year = {1976},
	series = {Biblioteca del pensamiento socialista},
	address = {México},
	note = {Translation of : Der Begriff der Natur in der Lehre von Marx}
}