Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.