Cita APA (7a ed.)

Darwin, C. R., & Burrow, J. W. (1986). The origin of species: By means of natural selection, o, The preservation of favoured races in the struggle for life. Penguin.

Cita Chicago Style (17a ed.)

Darwin, Charles Robert, y J. W. Burrow. The Origin of Species: By Means of Natural Selection, O, The Preservation of Favoured Races in the Struggle for Life. Middlesex, England: Penguin, 1986.

Cita MLA (8a ed.)

Darwin, Charles Robert, y J. W. Burrow. The Origin of Species: By Means of Natural Selection, O, The Preservation of Favoured Races in the Struggle for Life. Penguin, 1986.