APA (7th ed.) Citation

Helliar-Symons, R. D. (1981). Yellow bar experimental carriageway markings: Accident study. Transport and Road Research Laboratory.

Chicago Style (17th ed.) Citation

Helliar-Symons, R. D. Yellow Bar Experimental Carriageway Markings: Accident Study. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.

MLA (9th ed.) Citation

Helliar-Symons, R. D. Yellow Bar Experimental Carriageway Markings: Accident Study. Transport and Road Research Laboratory, 1981.