Angeles, E. Y. (1999). Educational challenges we face in the 21st century. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAngeles, Emmanuel Y. "Educational Challenges We Face in the 21st Century." Manila Bulletin 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAngeles, Emmanuel Y. "Educational Challenges We Face in the 21st Century." Manila Bulletin, 1999.
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