Citazione APA

Johnson, R. B., & Degraff, V. J. (1988). Principles of Engineering Geology. John Wiley.

Stile di citazione Chicago

Johnson, Robert. B., e V. Jerome Degraff. Principles of Engineering Geology. New Delhi: John Wiley, 1988.

Citazione MLA

Johnson, Robert. B., e V. Jerome Degraff. Principles of Engineering Geology. John Wiley, 1988.