Johnson, R. B., & Degraff, V. J. (1988). Principles of Engineering Geology. John Wiley.
Chicago Style citaatJohnson, Robert. B., en V. Jerome Degraff. Principles of Engineering Geology. New Delhi: John Wiley, 1988.
MLA citatieJohnson, Robert. B., en V. Jerome Degraff. Principles of Engineering Geology. John Wiley, 1988.
Let op: Deze citaties zijn niet altijd 100% accuraat.