Smith, W., & Voorhees, A. M. (1966). Traffic planning for the North Central Freeway: Prepared for the D.C. Department of Highways and Traffic and Maryland State Roads Commission in cooperation with U.S. Department of Commerce Bureau of Public Roads. New Haven: [s.n.].
Παραπομπή Chicago StyleSmith, Wilbur, and Allan M. Voorhees. Traffic Planning for the North Central Freeway: Prepared for the D.C. Department of Highways and Traffic and Maryland State Roads Commission in Cooperation With U.S. Department of Commerce Bureau of Public Roads. New Haven: [s.n.], 1966.
Παραπομπή MLASmith, Wilbur, and Allan M. Voorhees. Traffic Planning for the North Central Freeway: Prepared for the D.C. Department of Highways and Traffic and Maryland State Roads Commission in Cooperation With U.S. Department of Commerce Bureau of Public Roads. New Haven: [s.n.], 1966.