Chipongian, L. C. (2003). BIR expands paperless tax system registration. Manila Bulletin.
Dyfyniad Arddull ChicagoChipongian, Lee C. "BIR Expands Paperless Tax System Registration." Manila Bulletin 2003.
Dyfyniad MLAChipongian, Lee C. "BIR Expands Paperless Tax System Registration." Manila Bulletin, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.