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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAngeles, Emmanuel Y. "Distance Learning. IN Educators Speak [column]." Manila Bulletin 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAngeles, Emmanuel Y. "Distance Learning. IN Educators Speak [column]." Manila Bulletin, 1997.
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