Não informado. (1977). American transportation builder. American Road Builders Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. American Transportation Builder. Washington: American Road Builders Association, 1977.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. American Transportation Builder. American Road Builders Association, 1977.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.