APA (7th ed.) Citation
Darwin, C. R., & Hutchins, R. M. The Origin of Species: By Means of Natural Selection. Encyclopaedia Britannica.
Chicago Style (17th ed.) Citation
Darwin, Charles R., and Robert Maynard Hutchins. The Origin of Species: By Means of Natural Selection. Chicago, EUA: Encyclopaedia Britannica.
MLA (9th ed.) Citation
Darwin, Charles R., and Robert Maynard Hutchins. The Origin of Species: By Means of Natural Selection. Encyclopaedia Britannica.
Warning: These citations may not always be 100% accurate.