National Research Council (U.S.). Highway Research Board, Moyer, R. A., Shupe, J. W., & Morgan, A. D. (1951). Roughness and skid resistance: Presented at the Thirtieth Annual Meeting, 1951. Highway Research Board.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Highway Research Board, Ralph A. Moyer, John W. Shupe, और A. Duke Morgan. Roughness and Skid Resistance: Presented at the Thirtieth Annual Meeting, 1951. Washington, D.C: Highway Research Board, 1951.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Highway Research Board, et al. Roughness and Skid Resistance: Presented at the Thirtieth Annual Meeting, 1951. Highway Research Board, 1951.
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