APA (7th ed.) Citation

Lock, D. (2011). Emperor penguins (1st American ed.). DK Publishing.

Chicago Style (17th ed.) Citation

Lock, Deborah. Emperor Penguins. 1st American ed. New York, N.Y.: DK Publishing, 2011.

MLA (8th ed.) Citation

Lock, Deborah. Emperor Penguins. 1st American ed. DK Publishing, 2011.

Warning: These citations may not always be 100% accurate.