Thornbury, W. D. (1969). Principles of geomorphology (2d ed.). New Age International.
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Dyfyniad Arddull Chicago
Thornbury, William D. Principles of Geomorphology. 2d ed. New Delhi: New Age International, 1969.
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Dyfyniad MLA
Thornbury, William D. Principles of Geomorphology. 2d ed. New Age International, 1969.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.