Castillo, G. T. (2009). Growing old gracefully, not grudginly. IN Educators speak [column]. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCastillo, Gelia T. "Growing Old Gracefully, Not Grudginly. IN Educators Speak [column]." Manila Bulletin 2009.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCastillo, Gelia T. "Growing Old Gracefully, Not Grudginly. IN Educators Speak [column]." Manila Bulletin, 2009.
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