International Union of Public Transport. International Congress. (1991). 49th International Congress, Stockholm, 1991: [reports = rapports = berichte]. International Union (Association) of Public Transport.
Chicago-Zitierstil (17. Ausg.)International Union of Public Transport. International Congress. 49th International Congress, Stockholm, 1991: [reports = Rapports = Berichte]. Brussels: International Union (Association) of Public Transport, 1991.
MLA-Zitierstil (8. Ausg.)International Union of Public Transport. International Congress. 49th International Congress, Stockholm, 1991: [reports = Rapports = Berichte]. International Union (Association) of Public Transport, 1991.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.