APA (7e ed.) Bronvermelding

Darwin, C., Barrett, P. H., & Freeman, R. B. (1988). Variation of animals and plants under domestication, 1. Pickering.

Chicago (17e ed.) Bronvermelding

Darwin, Charles, Paul H. Barrett, en R. B. Freeman. Variation of Animals and Plants Under Domestication, 1. London: Pickering, 1988.

MLA (8e ed.) Bronvermelding

Darwin, Charles, et al. Variation of Animals and Plants Under Domestication, 1. Pickering, 1988.