Cita APA (7th ed.)

Darwin, C., & Burrow, J. W. (1968). The origin of species. Penguin Books.

Cita Chicago (17th ed.)

Darwin, Charles, i J. W. Burrow. The Origin of Species. Harmondsworth, Middlesex: Penguin Books, 1968.

Cita MLA (9th ed.)

Darwin, Charles, i J. W. Burrow. The Origin of Species. Penguin Books, 1968.