(1997). 3 firms vow to observe IPR laws. Manila Bulletin.
Cita Chicago (17th ed.)"3 Firms Vow to Observe IPR Laws." Manila Bulletin 1997.
Cita MLA (9th ed.)"3 Firms Vow to Observe IPR Laws." Manila Bulletin, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.