(1997). Philippine Civil Aviation: Is it prepared for the 21st century. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"Philippine Civil Aviation: Is It Prepared for the 21st Century." Manila Bulletin 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"Philippine Civil Aviation: Is It Prepared for the 21st Century." Manila Bulletin, 1997.
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