Gilluly, J., & Waters, A. C. (1968). Principles of Geology (3rd.ed.). W.H. Freeman & Co..
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Dyfyniad Arddull Chicago
Gilluly, James, and Aaron C. Waters. Principles of Geology. 3rd.ed. San Francisco: W.H. Freeman & Co., 1968.
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Dyfyniad MLA
Gilluly, James, and Aaron C. Waters. Principles of Geology. 3rd.ed. W.H. Freeman & Co., 1968.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.