Jeffery, D. J. (1981). Ways and means for improving driver route guidance. Transport and Road Research Laboratory.
Chicago Style (17. basım) AtıfJeffery, D. J. Ways and Means for Improving Driver Route Guidance. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.
MLA (9th ed.) AtıfJeffery, D. J. Ways and Means for Improving Driver Route Guidance. Transport and Road Research Laboratory, 1981.
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