APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.