Dyfyniad APA

Tarbuck, E. J., & Lutgens, F. K. (1993). The earth: An introduction to physical geology (4th ed.). MacMillan Publishing.

Dyfyniad Arddull Chicago

Tarbuck, Edward J., and Frederick K. Lutgens. The Earth: An Introduction to Physical Geology. 4th ed. New York: MacMillan Publishing, 1993.

Dyfyniad MLA

Tarbuck, Edward J., and Frederick K. Lutgens. The Earth: An Introduction to Physical Geology. 4th ed. MacMillan Publishing, 1993.

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