Cita APA (7a ed.)
Johnson, R. B., & Degraff, J. V. (1988). Principles of Engineering Geology. John Wiley & Sons.
Cita Chicago Style (17a ed.)
Johnson, Robert B., y Jerome V. Degraff. Principles of Engineering Geology. New Delhi: John Wiley & Sons, 1988.
Cita MLA (9a ed.)
Johnson, Robert B., y Jerome V. Degraff. Principles of Engineering Geology. John Wiley & Sons, 1988.
Precaución: Estas citas no son 100% exactas.