Casanova, S. (2002). Cellular service providers nix proposed phone card tax scheme. Manila Times.
Chicago Style (17. basım) AtıfCasanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times 2002.
MLA (9th ed.) AtıfCasanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times, 2002.
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