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Dyfyniad Arddull ChicagoKessides,Christine. Institutional Options for the Provision of Infrastructure. Washington: World Bank, 1993.
Dyfyniad MLAKessides,Christine. Institutional Options for the Provision of Infrastructure. World Bank, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.