Sources : IRU, World Transport Data 1990; IRF, World Road Statistics 1987-1991, édition de 1992; OACI, Digest of Statistics, Airport Traffic 1991; CESAP, Annuaire statistique pour l &apos; Asie et le Pacifique, 1992, et sources nationales.
Источники: IRU, World Transport Data 1990; IFR, World Road Statistics 1987-1991, выпуск 1992; ICAO, Digest of Statistics, Airport Traffic 1991; ESCAP, Statistical Yearbook for Asia and the Pacific 1992 и национальные источники.