423667 Webster, D. C., & Britain), T. R. L. (. (1993). An assessment of rumble strips and rumble areas. Crowthorne, Eng. : TRL.
Lua i Stíl Chicago (17ú heag.)423667 Webster, David C., agus Transport Research Laboratory (Great Britain). An Assessment of Rumble Strips and Rumble Areas. Crowthorne, Eng. : TRL, 1993.
Lua MLA (9ú heag.)423667 Webster, David C., agus Transport Research Laboratory (Great Britain). An Assessment of Rumble Strips and Rumble Areas. Crowthorne, Eng. : TRL, 1993.
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