Cita APA

Osborne, M. P. (1998). Polar bears past bedtime (1a. ed.). New York: Scholastic.

Citación estilo Chicago

Osborne, Mary Pope. Polar Bears Past Bedtime. 1a. ed. New York: Scholastic, 1998.

Cita MLA

Osborne, Mary Pope. Polar Bears Past Bedtime. 1a. ed. New York: Scholastic, 1998.