APA (7th ed.) Citation

Guttman, B. S., & Hopkins, J. W. (1983). Understanding biology. Harcourt Jovanovich.

Chicago Style (17th ed.) Citation

Guttman, Burton S., and Johns W. Hopkins. Understanding Biology. New York: Harcourt Jovanovich, 1983.

MLA (9th ed.) Citation

Guttman, Burton S., and Johns W. Hopkins. Understanding Biology. Harcourt Jovanovich, 1983.