Chorley, R. J., and Kennedy, B. A., 1971, Physical Geography: A Systems Approach: London, Prentice-Hall, 370 p.
Davis, W. M., 1899, The Geographical Cycle, in Davis, W. M., ed., Geographical Essays: Boston, Ginn and Co., p. 249-278; 777 pp.
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Chorley, R. J., and Kennedy, B. A., 1971, Physical Geography: A Systems Approach: London, Prentice-Hall, 370 p.
Davis, W. M., 1899, The Geographical Cycle, in Davis, W. M., ed., Geographical Essays: Boston, Ginn and Co., p. 249-278; 777 pp.