Darwin, C. (1951). On the origin of species by means of natural selection; or, The preservation of favoured races in the struggle for life. Philosophical Library.
Chicago-referens (17:e uppl.)Darwin, Charles. On the Origin of Species by Means of Natural Selection; or, The Preservation of Favoured Races in the Struggle for Life. New York: Philosophical Library, 1951.
MLA-referens (9:e uppl.)Darwin, Charles. On the Origin of Species by Means of Natural Selection; or, The Preservation of Favoured Races in the Struggle for Life. Philosophical Library, 1951.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.