De Vera, B. O. 15 more mining firms to undergo audit. Philippine Daily Inquirer.
Cita Chicago Style (17a ed.)De Vera, Ben O. "15 More Mining Firms to Undergo Audit." Philippine Daily Inquirer .
Cita MLA (9a ed.)De Vera, Ben O. "15 More Mining Firms to Undergo Audit." Philippine Daily Inquirer, .
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