Dyfyniad APA

Leet, L. D., & Judson, S. (1958). Physical geology (2nd ed.). Prentice Hall.

Dyfyniad Arddull Chicago

Leet, L. Don, and Sheldon Judson. Physical Geology. 2nd ed. New Jersey: Prentice Hall, 1958.

Dyfyniad MLA

Leet, L. Don, and Sheldon Judson. Physical Geology. 2nd ed. Prentice Hall, 1958.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.