Jeffery, D. J. (1981). Ways and means for improving driver route guidance. Transport and Road Research Laboratory.
Chicago (17e ed.) BronvermeldingJeffery, D. J. Ways and Means for Improving Driver Route Guidance. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.
MLA (9e ed.) BronvermeldingJeffery, D. J. Ways and Means for Improving Driver Route Guidance. Transport and Road Research Laboratory, 1981.
Let op: Deze citaties zijn niet altijd 100% accuraat.