Cita APA (7a ed.)
Darwin, C. R., & Hutchins, R. M. The Origin of Species: By Means of Natural Selection / The Descent of Man : And Selection in Relation to Sex. Encyclopaedia Britannica.
Cita estilo Chicago (17a ed.)
Darwin, Charles R., y Robert Maynard Hutchins. The Origin of Species: By Means of Natural Selection / The Descent of Man : And Selection in Relation to Sex. Chicago, EUA: Encyclopaedia Britannica.
Cita MLA (9a ed.)
Darwin, Charles R., y Robert Maynard Hutchins. The Origin of Species: By Means of Natural Selection / The Descent of Man : And Selection in Relation to Sex. Encyclopaedia Britannica.
Precaución: Estas citas no son 100% exactas.