Johnson, R. B., & Degraff, V. J. (1988). Principles of Engineering Geology. John Wiley.
シカゴスタイル引用形Johnson, Robert. B., , V. Jerome Degraff. Principles of Engineering Geology. New Delhi: John Wiley, 1988.
MLA引用形式Johnson, Robert. B., , V. Jerome Degraff. Principles of Engineering Geology. John Wiley, 1988.
警告: この引用は必ずしも正確ではありません.