Dyfyniad APA
Tarbuck, E. J., & Lutgens, F. K. (1987). The earth: An introduction to physical geology (2nd ed.). Merrill Pub. Co..
Dyfyniad Arddull Chicago
Tarbuck, Edward J., and Frederick K. Lutgens. The Earth: An Introduction to Physical Geology. 2nd ed. Columbus: Merrill Pub. Co., 1987.
Dyfyniad MLA
Tarbuck, Edward J., and Frederick K. Lutgens. The Earth: An Introduction to Physical Geology. 2nd ed. Merrill Pub. Co., 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.