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Dyfyniad Arddull ChicagoNas, Tevfik F. Cost-benefit Analysis: Theory and Application. London: Sage, 1996.
Dyfyniad MLANas, Tevfik F. Cost-benefit Analysis: Theory and Application. Sage, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.