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Dyfyniad Arddull ChicagoHenry, Paul-Marc 1918. Poverty, Progress and Development. London: Kegan Paul International, 1991.
Dyfyniad MLAHenry, Paul-Marc 1918. Poverty, Progress and Development. Kegan Paul International, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.