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Dyfyniad Arddull ChicagoQueen, Stuart Alfred, and Lewis Francis Thomas. The City; a Study of Urbanism in the United States. New York: McGraw-Hill, 1939.
Dyfyniad MLAQueen, Stuart Alfred, and Lewis Francis Thomas. The City; a Study of Urbanism in the United States. McGraw-Hill, 1939.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.