Darwin, C. (1981). The descent of man, and selection in relation to sex. Princeton University Press.
Chicago-referens (17:e uppl.)Darwin, Charles. The Descent of Man, and Selection in Relation to Sex. Princeton, N.J.: Princeton University Press, 1981.
MLA-referens (9:e uppl.)Darwin, Charles. The Descent of Man, and Selection in Relation to Sex. Princeton University Press, 1981.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.