Valencia, L. B. (2001). DOTC makes strides to develop major airports with safety requirements. Manila Bulletin.
Chicago-referens (17:e uppl.)Valencia, Lynda B. "DOTC Makes Strides to Develop Major Airports with Safety Requirements." Manila Bulletin 2001.
MLA-referens (9:e uppl.)Valencia, Lynda B. "DOTC Makes Strides to Develop Major Airports with Safety Requirements." Manila Bulletin, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.