APA (7th ed.) Zitazioa
Chouhan,B.S. Environmental studies / Chouhan,B.S: University Science Press.
Chicago Style (17th ed.) Zitazioa
Chouhan,B.S. Environmental Studies / Chouhan,B.S: University Science Press.
MLA (9th ed.) Zitazioa
Chouhan,B.S. Environmental Studies / Chouhan,B.S: University Science Press.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.