APA (7th ed.) Citation

Raven, P. H., & Johnson, G. B. (1991). Understanding biology (2nd ed.). Wm. C. Brown Publishers.

Chicago Style (17th ed.) Citation

Raven, Peter H., and George B. Johnson. Understanding Biology. 2nd ed. Dubuque, IA: Wm. C. Brown Publishers, 1991.

MLA (9th ed.) Citation

Raven, Peter H., and George B. Johnson. Understanding Biology. 2nd ed. Wm. C. Brown Publishers, 1991.