International Union of Public Transport. International Congress. (1991). 49th International Congress, Stockholm, 1991: [reports = rapports = berichte]. International Union (Association) of Public Transport.
Citazione stile Chigago Style (17a edizione)International Union of Public Transport. International Congress. 49th International Congress, Stockholm, 1991: [reports = Rapports = Berichte]. Brussels: International Union (Association) of Public Transport, 1991.
Citatione MLA (8a ed.)International Union of Public Transport. International Congress. 49th International Congress, Stockholm, 1991: [reports = Rapports = Berichte]. International Union (Association) of Public Transport, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.