APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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