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Dyfyniad Arddull ChicagoWorld Bank Highway Rehabilitation Project: Vienam Road Safety Study: Final Report. Washington DC: The World Bank, 2000.
Dyfyniad MLAWorld Bank Highway Rehabilitation Project: Vienam Road Safety Study: Final Report. Washington DC: The World Bank, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.