Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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