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Dyfyniad Arddull ChicagoWorld bank. Entering the 21st Century: World Development Report 1999/2000. Oxford: University press, 1999.
Dyfyniad MLAWorld bank. Entering the 21st Century: World Development Report 1999/2000. University press, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.