APA (7th ed.) Zitazioa
Nebel, B. (1996). Environmental science (5th.). Prentice Hall.
Chicago Style (17th ed.) Zitazioa
Nebel, Bernard. Environmental Science. 5th. New Jersey: Prentice Hall, 1996.
MLA (9th ed.) Zitazioa
Nebel, Bernard. Environmental Science. 5th. Prentice Hall, 1996.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.