@book{36111,
	author = {Darwin, Charles,},
	title = {El origen de las especies II /},
	publisher = {Origen/Porrúa },
	year = {1985.},
	series = {Obras maestras del pensamiento contemporaneo ;},
	address = {México },
	note = {Traducción de: On the origin of species by means of natural selection, or the preservation of favoured races in the struggle for life.}
}