Darwin, C. (1967). On the origin of spiecies. Athencum.
Chicago Style aipamenaDarwin, C. On the Origin of Spiecies. New York: Athencum, 1967.
MLA aipamenaDarwin, C. On the Origin of Spiecies. Athencum, 1967.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.