Cita APA (7a ed.)

Osborne, M. P., & Murdocca, S. (2008). Eve of the Emperor penguin. Random House.

Cita Chicago Style (17a ed.)

Osborne, Mary Pope, y Sal Murdocca. Eve of the Emperor Penguin. New York: Random House, 2008.

Cita MLA (8a ed.)

Osborne, Mary Pope, y Sal Murdocca. Eve of the Emperor Penguin. Random House, 2008.