APA (7e ed.) Bronvermelding

Não informado. (1990). Public Transport International. International Union of Public Transport.

Chicago (17e ed.) Bronvermelding

Não informado. Public Transport International. Bruxelles: International Union of Public Transport, 1990.

MLA (8e ed.) Bronvermelding

Não informado. Public Transport International. International Union of Public Transport, 1990.

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