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Dyfyniad Arddull ChicagoMiller, Roger LeRoy. Economics, Today and Tomorrow. 3rd ed. Mission Hills, Calif: Glencoe/McGraw-Hill, 1991.
Dyfyniad MLAMiller, Roger LeRoy. Economics, Today and Tomorrow. 3rd ed. Glencoe/McGraw-Hill, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.