Walker, R. S., & Phung, L. T. (1987). The Walker roughness device for roughness measurements. The University of Texas at Arlington ; [Available from the National Technical Information Service].
Chicago Style (17th ed.) CitationWalker, Roger S., and Luat Tan Phung. The Walker Roughness Device for Roughness Measurements. [Arlington, Tex.] : [Springfield, Va.]: The University of Texas at Arlington ; [Available from the National Technical Information Service], 1987.
MLA (9th ed.) CitationWalker, Roger S., and Luat Tan Phung. The Walker Roughness Device for Roughness Measurements. The University of Texas at Arlington ; [Available from the National Technical Information Service], 1987.
Warning: These citations may not always be 100% accurate.