APA (7th ed.) Zitazioa
Lowenthal, D. (2003). George Perkins Marsh: Prophet of conservation. University of Washington Press.
Chicago Style (17th ed.) Zitazioa
Lowenthal, David. George Perkins Marsh: Prophet of Conservation. Seattle, WA: University of Washington Press, 2003.
MLA (9th ed.) Zitazioa
Lowenthal, David. George Perkins Marsh: Prophet of Conservation. University of Washington Press, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.