HAMBLIN, W. K. & HOWARD, J. D. 1998. Exercises in Physical Geology, 10th ed. 256 pp. Upper Saddle River, NJ: Prentice Hall. Price not stated (spiral-bound paperback). ISBN 0 13 912379 2
Oeppen, Bridget
Geological Magazine, 2000, Vol.137 (2), p.211-216 [Periódico revisado por pares]Cambridge University Press
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