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Dyfyniad Arddull ChicagoJACKSON, John. Economics John Jackson, Cmpbell R. Mcconnell. McGraw-Hill, 1986.
Dyfyniad MLAJACKSON, John. Economics John Jackson, Cmpbell R. Mcconnell. McGraw-Hill, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.