Dyfyniad APA

Fichter, L. S., & Farmer, G. T. (1991). Earth materials and earth processes: An introduction (3rd ed.). Macmillan.

Dyfyniad Arddull Chicago

Fichter, Lynn S., and G. Thomas Farmer. Earth Materials and Earth Processes: An Introduction. 3rd ed. New York: Macmillan, 1991.

Dyfyniad MLA

Fichter, Lynn S., and G. Thomas Farmer. Earth Materials and Earth Processes: An Introduction. 3rd ed. Macmillan, 1991.

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