(1970). Census of transportation 1963. Washington, D.C: Government Printing Office.
Παραπομπή Chicago StyleCensus of Transportation 1963. Washington, D.C: Government Printing Office, 1970.
Παραπομπή MLACensus of Transportation 1963. Washington, D.C: Government Printing Office, 1970.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.