(1997). 3 firms vow to observe IPR laws. Manila Bulletin.
Cita Chicago Style (17a ed.)"3 Firms Vow to Observe IPR Laws." Manila Bulletin 1997.
Cita MLA (9a ed.)"3 Firms Vow to Observe IPR Laws." Manila Bulletin, 1997.
Precaución: Estas citas no son 100% exactas.