APA (7e ed.) Bronvermelding

Skinner, B. J. (1976). Earth resources (2nd ed.). Prentice-hall.

Chicago (17e ed.) Bronvermelding

Skinner, Brian J. Earth Resources. 2nd ed. Englewood Cliffs, N. J: Prentice-hall, 1976.

MLA (9e ed.) Bronvermelding

Skinner, Brian J. Earth Resources. 2nd ed. Prentice-hall, 1976.