Naciones Unidas. (1954). Railway operating and signalling techniques in Europe, Japan and the United States of America: Report of the expert working group from Asia and the far east on railway operating and signalling, 2 october 1952 - february 1953.
Citación estilo ChicagoNaciones Unidas. Railway Operating and Signalling Techniques in Europe, Japan and the United States of America: Report of the Expert Working Group From Asia and the Far East On Railway Operating and Signalling, 2 October 1952 - February 1953. New York, 1954.
Cita MLANaciones Unidas. Railway Operating and Signalling Techniques in Europe, Japan and the United States of America: Report of the Expert Working Group From Asia and the Far East On Railway Operating and Signalling, 2 October 1952 - February 1953. New York, 1954.