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Dyfyniad Arddull ChicagoJ. K. Lasser's Your Income Tax 2006: Prorfessional Edition. New Jersey: Jonh Wiley & Sons, 2005.
Dyfyniad MLAJ. K. Lasser's Your Income Tax 2006: Prorfessional Edition. New Jersey: Jonh Wiley & Sons, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.