De Vera, B. O. 15 more mining firms to undergo audit. Philippine Daily Inquirer.
Cita Chicago (17th ed.)De Vera, Ben O. "15 More Mining Firms to Undergo Audit." Philippine Daily Inquirer .
Cita MLA (9th ed.)De Vera, Ben O. "15 More Mining Firms to Undergo Audit." Philippine Daily Inquirer, .
Atenció: Aquestes cites poden no estar 100% correctes.