Casanova, S. (2002). Cellular service providers nix proposed phone card tax scheme. Manila Times.
Dyfyniad Arddull ChicagoCasanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times 2002.
Dyfyniad MLACasanova, Sheryll. "Cellular Service Providers Nix Proposed Phone Card Tax Scheme." Manila Times, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.