APA (7e ed.) Bronvermelding

Não informado. (1974). Directory. Transportation Research Board, National Research Council.

Chicago (17e ed.) Bronvermelding

Não informado. Directory. Washington: Transportation Research Board, National Research Council, 1974.

MLA (8e ed.) Bronvermelding

Não informado. Directory. Transportation Research Board, National Research Council, 1974.

Let op: Deze citaties zijn niet altijd 100% accuraat.