(1997). Philippine Civil Aviation: Is it prepared for the 21st century. Manila Bulletin.
Chicago-referens (17:e uppl.)"Philippine Civil Aviation: Is It Prepared for the 21st Century." Manila Bulletin 1997.
MLA-referens (9:e uppl.)"Philippine Civil Aviation: Is It Prepared for the 21st Century." Manila Bulletin, 1997.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.