(2023). Speed up aviation safety system upgrade - PBBM. Manila Bulletin.
Cita Chicago (17th ed.)"Speed Up Aviation Safety System Upgrade - PBBM." Manila Bulletin 2023.
Cita MLA (9th ed.)"Speed Up Aviation Safety System Upgrade - PBBM." Manila Bulletin, 2023.
Atenció: Aquestes cites poden no estar 100% correctes.