APA (7th ed.) Zitazioa
Cunningham William P. & Cunningham Mary Ann. (2015). Environmental Science: A global concern (13 th ed.). Mcgraw Hill Education (India).
Chicago Style (17th ed.) Zitazioa
Cunningham William P. eta Cunningham Mary Ann. Environmental Science: A Global Concern. 13 th ed. New Delhi: Mcgraw Hill Education (India), 2015.
MLA (9th ed.) Zitazioa
Cunningham William P. eta Cunningham Mary Ann. Environmental Science: A Global Concern. 13 th ed. Mcgraw Hill Education (India), 2015.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.