APA (7th ed.) Citation

Darwin, C. (1985). The Origin of species: By means of natural selection. Penguin Books.

Chicago Style (17th ed.) Citation

Darwin, Charles. The Origin of Species: By Means of Natural Selection. Penguin Books, 1985.

MLA (8th ed.) Citation

Darwin, Charles. The Origin of Species: By Means of Natural Selection. Penguin Books, 1985.

Warning: These citations may not always be 100% accurate.