Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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