APA (7th ed.) Citation

Cope, E. D. (1974). The origin of the fittest: [essays on evolution] and The primary factors of organic evolution. Arno Press.

Chicago Style (17th ed.) Citation

Cope, E. D. The Origin of the Fittest: [essays on Evolution] and The Primary Factors of Organic Evolution. New York: Arno Press, 1974.

MLA (9th ed.) Citation

Cope, E. D. The Origin of the Fittest: [essays on Evolution] and The Primary Factors of Organic Evolution. Arno Press, 1974.