Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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