Darwin, C., Barrett, P. H., & Freeman, R. B. (1989). The effects of cross and self fertilization in the vegetable kingdom. Pickering.
Chicago-viite (17. p.)Darwin, Charles, Paul H. Barrett, ja R. B. Freeman. The Effects of Cross and Self Fertilization in the Vegetable Kingdom. London: Pickering, 1989.
MLA-viite (8. p.)Darwin, Charles, et al. The Effects of Cross and Self Fertilization in the Vegetable Kingdom. Pickering, 1989.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.