Darwin, C. (2003). On the origin of species by means of natural selection: Or the preservation of favoured races in the struggle for life. Wildside Press.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Darwin, Charles. On the Origin of Species by Means of Natural Selection: Or the Preservation of Favoured Races in the Struggle for Life. Holicong, PA: Wildside Press, 2003.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Darwin, Charles. On the Origin of Species by Means of Natural Selection: Or the Preservation of Favoured Races in the Struggle for Life. Wildside Press, 2003.
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