Cita APA

Cunningham, W. P., & Cunningham, M. A. (2012). Environmental science: A global concern (12th ed.). McGraw-Hill Companies, Inc.

Citación estilo Chicago

Cunningham, William P., and Mary Ann Cunningham. Environmental Science: A Global Concern. 12th ed. New York: McGraw-Hill Companies, Inc, 2012.

Cita MLA

Cunningham, William P., and Mary Ann Cunningham. Environmental Science: A Global Concern. 12th ed. McGraw-Hill Companies, Inc, 2012.