APA (7th ed.) Citation

Vergas, F., Harrison, S., Rea, S., & Macdonald, D. (2006). Biological effects of El Niño on the Galápagos penguin. Elsevier.

Chicago Style (17th ed.) Citation

Vergas, F., S. Harrison, S. Rea, and D. Macdonald. Biological Effects of El Niño on the Galápagos Penguin. Elsevier, 2006.

MLA (9th ed.) Citation

Vergas, F., et al. Biological Effects of El Niño on the Galápagos Penguin. Elsevier, 2006.