Porter, R. C. (2002). The economics of waste. Washington, DC: Resources for the Future.
Dyfyniad Arddull ChicagoPorter, Richard C. The Economics of Waste. Washington, DC: Resources for the Future, 2002.
Dyfyniad MLAPorter, Richard C. The Economics of Waste. Washington, DC: Resources for the Future, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.