Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Warning: These citations may not always be 100% accurate.