Παραπομπή APA

Cunningham, W. P., & Cunningham, M. A. (2007). Principles of environmental science: Inquiry and applications (4th ed.). Tata McGraw-Hill.

Παραπομπή Chicago Style

Cunningham, William P., και Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 4th ed. New Delhi: Tata McGraw-Hill, 2007.

Παραπομπή MLA

Cunningham, William P., και Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 4th ed. Tata McGraw-Hill, 2007.