APA (7th ed.) Citation

Johnson, R. B., & De Graff, J. V. (1988). Principles of engineering geology. Wiley.

Chicago Style (17th ed.) Citation

Johnson, Robert B., and Jerome V. De Graff. Principles of Engineering Geology. New York [u.a.]: Wiley, 1988.

MLA (9th ed.) Citation

Johnson, Robert B., and Jerome V. De Graff. Principles of Engineering Geology. Wiley, 1988.