Cita APA (7th ed.)
Morgan, R. P. C. (1979). Soil Erosion. Longman.
Cita Chicago (17th ed.)
Morgan, R. P. C. Soil Erosion. London: Longman, 1979.
Cita MLA (9th ed.)
Morgan, R. P. C. Soil Erosion. Longman, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.