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Dyfyniad Arddull ChicagoNivola, Pietro S. Laws of the Landscape: How Policies Shape Cities in Europe and America. Washington, D.C.: Brookings Institution, 1999.
Dyfyniad MLANivola, Pietro S. Laws of the Landscape: How Policies Shape Cities in Europe and America. Brookings Institution, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.