Darwin, C. (1996). The origin of species by means of natural selection: The descent of man and selection in relation to sex (2nd, 6th print.). Encyclopædia Britannica.
Чикаго стиль цитування (17-те видання)Darwin, Charles. The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to Sex. 2nd, 6th print. Chicago: Encyclopædia Britannica, 1996.
Стиль цитування MLA (9-ме видання)Darwin, Charles. The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to Sex. 2nd, 6th print. Encyclopædia Britannica, 1996.
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