(1990). World development report 1990. Oxford University Press.
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Dyfyniad Arddull Chicago
World Development Report 1990. Oxford: Oxford University Press, 1990.
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Dyfyniad MLA
World Development Report 1990. Oxford University Press, 1990.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.