APA Citation

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

Chicago Style Citation

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

MLA Citation

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

Warning: These citations may not always be 100% accurate.