APA (7th ed.) Citation

Davis, L. S., & Darby, J. (1990). Penguin biology. Academic Press.

Chicago Style (17th ed.) Citation

Davis, Lloyd Spencer, and John Darby. Penguin Biology. San Diego: Academic Press, 1990.

MLA (9th ed.) Citation

Davis, Lloyd Spencer, and John Darby. Penguin Biology. Academic Press, 1990.