APA (7th ed.) Zitazioa
Cunningham, W., & Cunningham, M. A. (2004). Principles of environmental science: Enquiry and applications (2nd ed.). Tata McGraw-Hill.
Chicago Style (17th ed.) Zitazioa
Cunningham, William, eta Mary Ann Cunningham. Principles of Environmental Science: Enquiry and Applications. 2nd ed. New Delhi: Tata McGraw-Hill, 2004.
MLA (9th ed.) Zitazioa
Cunningham, William, eta Mary Ann Cunningham. Principles of Environmental Science: Enquiry and Applications. 2nd ed. Tata McGraw-Hill, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.