(2003). Drug firms told to seek PDEA's permission. Manila Times.
Cita Chicago (17th ed.)"Drug Firms Told to Seek PDEA's Permission." Manila Times 2003.
Cita MLA (9th ed.)"Drug Firms Told to Seek PDEA's Permission." Manila Times, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.