Cita APA (7a ed.)

Darwin, C., Groeben, C., & Dohrn, A. (1982). Correspondance. Macchiaroli.

Cita Chicago Style (17a ed.)

Darwin, Charles, Christiane Groeben, y Anton Dohrn. Correspondance. Napoli: Macchiaroli, 1982.

Cita MLA (9a ed.)

Darwin, Charles, et al. Correspondance. Macchiaroli, 1982.