APA (7th ed.) Citation

Helliar-Symons, R. (1984). Automatic speed warning sign - Hampshire trials. Transport and Road Research Laboratory.

Chicago Style (17th ed.) Citation

Helliar-Symons, R.D. Automatic Speed Warning Sign - Hampshire Trials. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1984.

MLA (9th ed.) Citation

Helliar-Symons, R.D. Automatic Speed Warning Sign - Hampshire Trials. Transport and Road Research Laboratory, 1984.