Cita APA (7a ed.)

Cunningham, W. P. (2001). Environmental science: A global concern (6th edition.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Cunningham, William P. Environmental Science: A Global Concern. 6th edition. New York: McGraw-Hill, 2001.

Cita MLA (9a ed.)

Cunningham, William P. Environmental Science: A Global Concern. 6th edition. McGraw-Hill, 2001.