@book {Darwin1871a,
	title = {The Ascent of Man, and Selection in Relation to Sex},
	volume = {1},
	year = {1871},
	publisher = {John Murray},
	organization = {John Murray},
	edition = {1},
	address = {London},
	url = {http://darwin-online.org.uk/pdf/1871{\_}Descent{\_}F937.1.pdf},
	author = {Darwin, Charles}
}
