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European Conference of Ministers of Transport. (1974). Report of the twenty-fourth Round Table on Transport Economics, held in Paris on 22nd and 23rd November, 1973 on the following topic: Economic criteria for the maintenance, modification or creation of public urban and suburban transport services. OECD.

European Conference of Ministers of Transport. Report of the Twenty-fourth Round Table on Transport Economics, Held in Paris on 22nd and 23rd November, 1973 on the Following Topic: Economic Criteria for the Maintenance, Modification or Creation of Public Urban and Suburban Transport Services. Paris: OECD, 1974.

European Conference of Ministers of Transport. Report of the Twenty-fourth Round Table on Transport Economics, Held in Paris on 22nd and 23rd November, 1973 on the Following Topic: Economic Criteria for the Maintenance, Modification or Creation of Public Urban and Suburban Transport Services. OECD, 1974.

European Conference of Ministers of Transport. 1974. Report of the twenty-fourth Round Table on Transport Economics, held in Paris on 22nd and 23rd November, 1973 on the following topic: Economic criteria for the maintenance, modification or creation of public urban and suburban transport services. Paris: OECD.