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Dyfyniad Arddull ChicagoRiddell, Robert. Sustainable Urban Planning: Tipping the Balance. Oxford: Blackwell, 2004.
Dyfyniad MLARiddell, Robert. Sustainable Urban Planning: Tipping the Balance. Blackwell, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.