Batino, M. C. S. (2002). Phone cards firms biggest cheats - BIR. Philippine Daily Inquirer.
Cita Chicago (17th ed.)Batino, Ma. Clarissa S. "Phone Cards Firms Biggest Cheats - BIR." Philippine Daily Inquirer 2002.
Cita MLA (9th ed.)Batino, Ma. Clarissa S. "Phone Cards Firms Biggest Cheats - BIR." Philippine Daily Inquirer, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.