APA (7e ed.) Bronvermelding

Osborne, M. P., & Murdocca, S. (1998). Polar bears past bedtime. Random House.

Chicago (17e ed.) Bronvermelding

Osborne, Mary Pope, en Sal Murdocca. Polar Bears Past Bedtime. New York: Random House, 1998.

MLA (8e ed.) Bronvermelding

Osborne, Mary Pope, en Sal Murdocca. Polar Bears Past Bedtime. Random House, 1998.