APA (7th ed.) Citation

Cunningham, W. P., & Nelson, D. (1994). Understanding our environment: An introduction. Wm. C. Brown Communications.

Chicago Style (17th ed.) Citation

Cunningham, William P., and Darby Nelson. Understanding Our Environment: An Introduction. Dubuque: Wm. C. Brown Communications, 1994.

MLA (8th ed.) Citation

Cunningham, William P., and Darby Nelson. Understanding Our Environment: An Introduction. Wm. C. Brown Communications, 1994.