APA (7th ed.) Citation
Raven, P. H., & Johnson, G. B. (1991). Understanding biology (2nd ed.). WCB Brown Publishers.
Chicago Style (17th ed.) Citation
Raven, Peter H., and George B. Johnson. Understanding Biology. 2nd ed. Dubuque: WCB Brown Publishers, 1991.
MLA (9th ed.) Citation
Raven, Peter H., and George B. Johnson. Understanding Biology. 2nd ed. WCB Brown Publishers, 1991.
Warning: These citations may not always be 100% accurate.