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Dyfyniad Arddull ChicagoKeen, Peter G. W., and H. G. Sol. Decision Enhancement Services: Rehearsing the Future for Decisions That Matter. Amsterdam: IOS Press, 2008.
Dyfyniad MLAKeen, Peter G. W., and H. G. Sol. Decision Enhancement Services: Rehearsing the Future for Decisions That Matter. IOS Press, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.