Casanova, S. (2002). Cellular service providers nix proposed phone card tax scheme. Manila Times.
Citazione stile Chigago Style (17a edizione)Casanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times 2002.
Citatione MLA (9a ed.)Casanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.