(1961). World Traffic Engineering Conference: Combining 31st Annual Meeting, Institute of Traffic Engineers, Aug. 21-23, 1961 [and] International Sessions in Traffic Engineering, Aug. 24-26, 1961, Washington, D.C. Washington, D.C: The Institute.
Παραπομπή Chicago StyleWorld Traffic Engineering Conference: Combining 31st Annual Meeting, Institute of Traffic Engineers, Aug. 21-23, 1961 [and] International Sessions in Traffic Engineering, Aug. 24-26, 1961, Washington, D.C. Washington, D.C: The Institute, 1961.
Παραπομπή MLAWorld Traffic Engineering Conference: Combining 31st Annual Meeting, Institute of Traffic Engineers, Aug. 21-23, 1961 [and] International Sessions in Traffic Engineering, Aug. 24-26, 1961, Washington, D.C. Washington, D.C: The Institute, 1961.