Não informado. (1948). Highway Engineer. Institution of Highway Engineers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Highway Engineer. London: Institution of Highway Engineers, 1948.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Highway Engineer. Institution of Highway Engineers, 1948.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.
