Casanova, S. (2002). Cellular service providers nix proposed phone card tax scheme. Manila Times.
Cita Chicago (17th ed.)Casanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times 2002.
Cita MLA (9th ed.)Casanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.