Cita APA (7a ed.)

Kooyman, G. L., & Lynch, W. (2013). Penguins: The Animal Answer Guide. The Johns Hopkins University Press.

Cita Chicago Style (17a ed.)

Kooyman, Gerald L., y Wayne Lynch. Penguins: The Animal Answer Guide. Baltimore: The Johns Hopkins University Press, 2013.

Cita MLA (8a ed.)

Kooyman, Gerald L., y Wayne Lynch. Penguins: The Animal Answer Guide. The Johns Hopkins University Press, 2013.