Não informado. (1977). Transportation Engineering. Institute of Transportation Engineers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Transportation Engineering. Arlington, Va: Institute of Transportation Engineers, 1977.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Transportation Engineering. Institute of Transportation Engineers, 1977.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.