Federal Inland Revenue Service. FIRS Handbook on Reforms in the Tax System 2004-2011. Safari Books.
Chicago Style (17. basım) AtıfFederal Inland Revenue Service. FIRS Handbook on Reforms in the Tax System 2004-2011. Safari Books.
MLA (8th ed.) AtıfFederal Inland Revenue Service. FIRS Handbook on Reforms in the Tax System 2004-2011. Safari Books.
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