APA (7th ed.) Zitazioa
Klaasen, R. (1979). How green is my mountain. Inter Vasity Press.
Chicago Style (17th ed.) Zitazioa
Klaasen, Ruth. How Green Is My Mountain. Illinois: Inter Vasity Press, 1979.
MLA (9th ed.) Zitazioa
Klaasen, Ruth. How Green Is My Mountain. Inter Vasity Press, 1979.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.