Webster, D. C., & Layfield, R. E. (1993). An assessment of rumble strips and rumble areas. Traffic and Transport Resource Centre, Transport Research Laboratory.
Chicago Style (17th ed.) CitationWebster, David C., and Roger E. Layfield. An Assessment of Rumble Strips and Rumble Areas. Crowthorne, Berkshire: Traffic and Transport Resource Centre, Transport Research Laboratory, 1993.
MLA (9th ed.) CitationWebster, David C., and Roger E. Layfield. An Assessment of Rumble Strips and Rumble Areas. Traffic and Transport Resource Centre, Transport Research Laboratory, 1993.
Warning: These citations may not always be 100% accurate.