Cita APA (7a ed.)

Cope, E. D. (1887). The Origin of the Fittest: Essays on Evolution. D. Appleton & Cy..

Cita Chicago Style (17a ed.)

Cope, E. D. The Origin of the Fittest: Essays on Evolution. New York: D. Appleton & Cy., 1887.

Cita MLA (8a ed.)

Cope, E. D. The Origin of the Fittest: Essays on Evolution. D. Appleton & Cy., 1887.