Jeffery, D. J. (1981). Ways and means for improving driver route guidance. Transport and Road Research Laboratory.
Chicago-Zitierstil (17. Ausg.)Jeffery, D. J. Ways and Means for Improving Driver Route Guidance. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.
MLA-Zitierstil (9. Ausg.)Jeffery, D. J. Ways and Means for Improving Driver Route Guidance. Transport and Road Research Laboratory, 1981.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.