Dyfyniad APA

Dott, R. H. (1988). Evolution of the earth (4th ed.). McGraw-Hill Book Co., Inc.

Dyfyniad Arddull Chicago

Dott, Robert H. Evolution of the Earth. 4th ed. New York: McGraw-Hill Book Co., Inc, 1988.

Dyfyniad MLA

Dott, Robert H. Evolution of the Earth. 4th ed. McGraw-Hill Book Co., Inc, 1988.

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