APA استشهاد

Cunningham, W. P., & Cunningham, M. A. (2008). Environmental science: A global concern (10 th ed.). McGraw Hill.

استشهاد بنمط شيكاغو

Cunningham, William P., و Mary Ann Cunningham. Environmental Science: A Global Concern. 10 th ed. Boston: McGraw Hill, 2008.

MLA استشهاد

Cunningham, William P., و Mary Ann Cunningham. Environmental Science: A Global Concern. 10 th ed. McGraw Hill, 2008.