Valencia, L. B. (2001). DOTC makes strides to develop major airports with safety requirements. Manila Bulletin.
Citazione stile Chigago Style (17a edizione)Valencia, Lynda B. "DOTC Makes Strides to Develop Major Airports with Safety Requirements." Manila Bulletin 2001.
Citatione MLA (9a ed.)Valencia, Lynda B. "DOTC Makes Strides to Develop Major Airports with Safety Requirements." Manila Bulletin, 2001.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.