APA (7th ed.) Citation

Atwater, R., Atwater, F., & Lawson, R. (1988). Mr. Popper's penguins. Little, Brown and Co..

Chicago Style (17th ed.) Citation

Atwater, Richard, Florence Atwater, and Robert Lawson. Mr. Popper's Penguins. Boston: Little, Brown and Co., 1988.

MLA (8th ed.) Citation

Atwater, Richard, et al. Mr. Popper's Penguins. Little, Brown and Co., 1988.

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