APA (7th ed.) Citation

Darwin, C. (1952). The Origin of species by means of natural selection: The Descent of man and selection in relation to sex. Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

Darwin, Charles. The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to Sex. Chicago [etc.]: Encyclopaedia Britannica, 1952.

MLA (9th ed.) Citation

Darwin, Charles. The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to Sex. Encyclopaedia Britannica, 1952.