Barker, J. L. NEMA standards for traffic control systems. Traffic engineering : official publication of the Institute of Transportation Engineers.
Citace podle Chicago (17th ed.)Barker, John L. "NEMA Standards for Traffic Control Systems." Traffic Engineering : Official Publication of the Institute of Transportation Engineers .
Citace podle MLA (9th ed.)Barker, John L. "NEMA Standards for Traffic Control Systems." Traffic Engineering : Official Publication of the Institute of Transportation Engineers, .
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