Dyfyniad APA

Lutgens, F. K., & Tarbuck, E. J. (2011). Foundations of earth science (6th ed.). Pearson Prentice Hall.

Dyfyniad Arddull Chicago

Lutgens, Frederick K., and Edward J. Tarbuck. Foundations of Earth Science. 6th ed. Upper Saddle River, N.J: Pearson Prentice Hall, 2011.

Dyfyniad MLA

Lutgens, Frederick K., and Edward J. Tarbuck. Foundations of Earth Science. 6th ed. Pearson Prentice Hall, 2011.

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