Hudson, J., & Drew, S. D. (1976). An impact penetrometer for assessing the cuttability of soft rocks. Transport and Road Research Laboratory.
Chicago Style (17th ed.) CitationHudson, John, and S. D. Drew. An Impact Penetrometer for Assessing the Cuttability of Soft Rocks. Crowthorne, Berkshire, Eng.: Transport and Road Research Laboratory, 1976.
MLA (9th ed.) CitationHudson, John, and S. D. Drew. An Impact Penetrometer for Assessing the Cuttability of Soft Rocks. Transport and Road Research Laboratory, 1976.
Warning: These citations may not always be 100% accurate.