एपीए उद्धरण

Peter W Birkeland. (1984). Soils and geomorphology. New York: Oxford University.

शिकागो स्टाइल उद्धरण

Peter W Birkeland. Soils and Geomorphology. New York: Oxford University, 1984.

एमएलए उद्धरण

Peter W Birkeland. Soils and Geomorphology. New York: Oxford University, 1984.