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Dyfyniad Arddull ChicagoRoth, Gabriel Joseph. The Private Provision of Public Services in Developing Countries. New York: Oxford University Press, 1987.
Dyfyniad MLARoth, Gabriel Joseph. The Private Provision of Public Services in Developing Countries. Oxford University Press, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.