TRL Library Services. (1997). Safety barriers update, 1994-1996. Library Services, Transport Research Laboratory.
Chicago Style (17th ed.) CitationTRL Library Services. Safety Barriers Update, 1994-1996. Crowthorne, Berkshire: Library Services, Transport Research Laboratory, 1997.
MLA (9th ed.) CitationTRL Library Services. Safety Barriers Update, 1994-1996. Library Services, Transport Research Laboratory, 1997.
Warning: These citations may not always be 100% accurate.