APA (7th ed.) Citation

Cunningham, W. P., & Cunningham, M. A. Principles of Environmental Science (9th ed.). Unknown.

Chicago Style (17th ed.) Citation

Cunningham, William P., and Mary Ann Cunningham. Principles of Environmental Science. 9th ed. Unknown: Unknown.

MLA (9th ed.) Citation

Cunningham, William P., and Mary Ann Cunningham. Principles of Environmental Science. 9th ed. Unknown.

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