Courtney, F. (1976). The soil : an introduction to soil: Study. Hodder and Stoughton.
Cita Chicago (17th ed.)Courtney, F.M. The Soil : An Introduction to Soil: Study. London: Hodder and Stoughton, 1976.
Cita MLA (9th ed.)Courtney, F.M. The Soil : An Introduction to Soil: Study. Hodder and Stoughton, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.