Não informado. (1957). American road builder. American Road Builders Association.
Chicago (17e ed.) BronvermeldingNão informado. American Road Builder. Washington: American Road Builders Association, 1957.
MLA (8e ed.) BronvermeldingNão informado. American Road Builder. American Road Builders Association, 1957.
Let op: Deze citaties zijn niet altijd 100% accuraat.