National Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, & Potts, I. B. (2004). Safety of U-turns at unsignalized median openings. Transportation Research Board.
Citace podle Chicago (17th ed.)National Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, a Ingrid B. Potts. Safety of U-turns at Unsignalized Median Openings. Washington, D.C: Transportation Research Board, 2004.
Citace podle MLA (9th ed.)National Cooperative Highway Research Program, et al. Safety of U-turns at Unsignalized Median Openings. Transportation Research Board, 2004.
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