Cofnodi Dyfyniadau
Dyfyniad APA
Levin, H. L. (1990). Contemporary physical geology (3rd ed.). Saunders College Pub..
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Dyfyniad Arddull Chicago
Levin, Harold L. Contemporary Physical Geology. 3rd ed. Philadelphia, Pa.: Saunders College Pub., 1990.
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Dyfyniad MLA
Levin, Harold L. Contemporary Physical Geology. 3rd ed. Saunders College Pub., 1990.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.