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Dyfyniad Arddull ChicagoHarris, Nigel. Cities in the 1990s: The Challenge for Developing Countries. London: St. Martin's Press, 1992.
Dyfyniad MLAHarris, Nigel. Cities in the 1990s: The Challenge for Developing Countries. St. Martin's Press, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.