Dyfyniad APA

Hamblin, W. K. 1., & Howard, J. D. (1992). Exercises in physical geology. New York: Macmillan Pub. Co..

Dyfyniad Arddull Chicago

Hamblin, W. Kenneth 1928-, và James D. Howard. Exercises in Physical Geology. New York: Macmillan Pub. Co., 1992.

Dyfyniad MLA

Hamblin, W. Kenneth 1928-, và James D. Howard. Exercises in Physical Geology. New York: Macmillan Pub. Co., 1992.

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