Dyfyniad APA

Allison, I. S. (1980). Geology the science of a changing earth. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

Allison, Ira Shimmin. Geology the Science of a Changing Earth. New York: McGraw-Hill, 1980.

Dyfyniad MLA

Allison, Ira Shimmin. Geology the Science of a Changing Earth. New York: McGraw-Hill, 1980.

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