(1965). Highway research record: Freeway charasteristics, operations and accidents. Washington, D.C: National Research Council.
Παραπομπή Chicago StyleHighway Research Record: Freeway Charasteristics, Operations and Accidents. Washington, D.C: National Research Council, 1965.
Παραπομπή MLAHighway Research Record: Freeway Charasteristics, Operations and Accidents. Washington, D.C: National Research Council, 1965.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.