Não informado. (1990). Public Transport International. International Union of Public Transport.
Chicagoスタイル(17版)引用形式Não informado. Public Transport International. Bruxelles: International Union of Public Transport, 1990.
MLA(8版)引用形式Não informado. Public Transport International. International Union of Public Transport, 1990.
警告: この引用は必ずしも正確ではありません.