APA (7th ed.) Citation

Darwin, C. (1985). The origin of species by means of natural selection or the preservation of favoured races in the struggle for life. Penguin Books.

Chicago Style (17th ed.) Citation

Darwin, Charles. The Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. London a. o: Penguin Books, 1985.

MLA (8th ed.) Citation

Darwin, Charles. The Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. Penguin Books, 1985.