Cita APA (7th ed.)
Lowenthal, D. (2003). George Perkins Marsh: Prophet of conservation. University of Washington Press.
Cita Chicago (17th ed.)
Lowenthal, David. George Perkins Marsh: Prophet of Conservation. Seattle, WA: University of Washington Press, 2003.
Cita MLA (9th ed.)
Lowenthal, David. George Perkins Marsh: Prophet of Conservation. University of Washington Press, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.