Zona degradada: diferència entre les revisions

*{{cite conference | first = H. | last = Eswaran | coauthors = R. Lal and P.F. Reich. | year = 2001 | title = Land degradation: an overview | booktitle = Responses to Land Degradation. Proc. 2nd. International Conference on Land Degradation and Desertification | publisher = Oxford Press | location = New Delhi, India | url = http://soils.usda.gov/use/worldsoils/papers/land-degradation-overview.html |}}

*D.L. Johnson and L.A. Lewis ''Land Degradation:Creation and Destruction'', 2nd edition, Rowman and Littlefield, Lanham, Boulder, New York, Toronto, Oxford, 2007.