Cita APA

Darwin, C. R. 1., & Darwin, C. R. 1. (1991). The origin of species: By means of natural selection. Buffalo, N.Y.: Prometheus Books.

Citación estilo Chicago

Darwin, Charles Robert 1809-1882, y Charles Robert 1809-1882 Darwin. The Origin of Species: By Means of Natural Selection. Buffalo, N.Y.: Prometheus Books, 1991.

Cita MLA

Darwin, Charles Robert 1809-1882, y Charles Robert 1809-1882 Darwin. The Origin of Species: By Means of Natural Selection. Buffalo, N.Y.: Prometheus Books, 1991.