Cita APA (7th ed.)

Darwin, C., Barrett, P. H., & Freeman, R. B. (1989). The descent of man, and selection in relation to sex, 2. Pickering.

Cita Chicago (17th ed.)

Darwin, Charles, Paul H. Barrett, i R. B. Freeman. The Descent of Man, and Selection in Relation to Sex, 2. London: Pickering, 1989.

Cita MLA (8th ed.)

Darwin, Charles, et al. The Descent of Man, and Selection in Relation to Sex, 2. Pickering, 1989.