Cita APA (7a ed.)

Darwin, C. R., & Ridley, M. (1994). A Darwin selection. Fontana books.

Cita Chicago Style (17a ed.)

Darwin, Charles Robert, y Mark Ridley. A Darwin Selection. London: Fontana books, 1994.

Cita MLA (9a ed.)

Darwin, Charles Robert, y Mark Ridley. A Darwin Selection. Fontana books, 1994.