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Dyfyniad Arddull ChicagoGottlieb, Manuel. Long Swings in Urban Development. New York: National Bureau of Economic Research, 1976.
Dyfyniad MLAGottlieb, Manuel. Long Swings in Urban Development. National Bureau of Economic Research, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.