Cita APA (7a ed.)

Darwin, C., & Browne, E. J. (2017). The quotable Darwin. Princeton University Press.

Cita Chicago Style (17a ed.)

Darwin, Charles, y E. J. Browne. The Quotable Darwin. Princeton: Princeton University Press, 2017.

Cita MLA (8a ed.)

Darwin, Charles, y E. J. Browne. The Quotable Darwin. Princeton University Press, 2017.