APA-referens (7:e uppl.)
Cunningham, W. P., & Cunningham, M. A. (2004). Principles of environmental science: Inquiry and applications (2nd ed.). McGraw-Hill Higher Education; Tata McGraw-Hill.
Chicago-referens (17:e uppl.)
Cunningham, William P., och Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 2nd ed. Boston ; New Delhi: McGraw-Hill Higher Education; Tata McGraw-Hill, 2004.
MLA-referens (9:e uppl.)
Cunningham, William P., och Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 2nd ed. McGraw-Hill Higher Education; Tata McGraw-Hill, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.