Chipongian, L. C. (2003). BIR expands paperless tax system registration. Manila Bulletin.
Chicago-viite (17. p.)Chipongian, Lee C. "BIR Expands Paperless Tax System Registration." Manila Bulletin 2003.
MLA-viite (9. p.)Chipongian, Lee C. "BIR Expands Paperless Tax System Registration." Manila Bulletin, 2003.
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