@book{99918,
	author = {Darwin, Charles Robert, and Darwin, Charles Robert,},
	title = {El origen de las especies por la selección natural},
	publisher = {Ediciones Ibéricas},
	year = {1963.},
	address = {Madrid},
	note = {Translation of : The origin of species by means of natural selection. The descent of man and selection in relation to sex.}
}