APA استشهاد

Cunningham, W. P., & Cunningham, M. A. S. (2007). Environmental science: A global concern (9th ed.). Mc Graw- Hill.

استشهاد بنمط شيكاغو

Cunningham, William P., و Mary Ann Saigo Cunningham. Environmental Science: A Global Concern. 9th ed. Boston: Mc Graw- Hill, 2007.

MLA استشهاد

Cunningham, William P., و Mary Ann Saigo Cunningham. Environmental Science: A Global Concern. 9th ed. Mc Graw- Hill, 2007.