Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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