Não informado. (1969). Highways & Traffic Engineering. IPC Building and Contract Journals.
Chicago (17e ed.) BronvermeldingNão informado. Highways & Traffic Engineering. London: IPC Building and Contract Journals, 1969.
MLA (8e ed.) BronvermeldingNão informado. Highways & Traffic Engineering. IPC Building and Contract Journals, 1969.
Let op: Deze citaties zijn niet altijd 100% accuraat.