Casanova, S. (2002). Cellular service providers nix proposed phone card tax scheme. Manila Times.
Chicago-referens (17:e uppl.)Casanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times 2002.
MLA-referens (9:e uppl.)Casanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.