Cita APA (7a ed.)

Darwin, C. R. (1995). The galapagos islands. Penguin Books.

Cita Chicago Style (17a ed.)

Darwin, Charles Robert. The Galapagos Islands. London: Penguin Books, 1995.

Cita MLA (9a ed.)

Darwin, Charles Robert. The Galapagos Islands. Penguin Books, 1995.