APA (7e ed.) Bronvermelding

Darwin, C., Barrett, P. H., & Freeman, R. B. (1989). The effects of cross and self fertilization in the vegetable kingdom. Pickering.

Chicago (17e ed.) Bronvermelding

Darwin, Charles, Paul H. Barrett, en R. B. Freeman. The Effects of Cross and Self Fertilization in the Vegetable Kingdom. London: Pickering, 1989.

MLA (8e ed.) Bronvermelding

Darwin, Charles, et al. The Effects of Cross and Self Fertilization in the Vegetable Kingdom. Pickering, 1989.