European Economic Community, Organisation for Economic Co-operation and Development, & European Conference of Ministers of Transport. (1977). The future of European passenger transport: Final report on the O.E.C.D. study on European inter-city passenger transport requirements, and appendices. O.E.C.D.

European Economic Community, Organisation for Economic Co-operation and Development, and European Conference of Ministers of Transport. The Future of European Passenger Transport: Final Report on the O.E.C.D. Study on European Inter-city Passenger Transport Requirements, and Appendices. Paris: O.E.C.D, 1977.

European Economic Community, et al. The Future of European Passenger Transport: Final Report on the O.E.C.D. Study on European Inter-city Passenger Transport Requirements, and Appendices. O.E.C.D, 1977.