Castro, E. R. (1998). Finally, free but quality pre-school education. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCastro, Eddee RH. "Finally, Free but Quality Pre-school Education." Manila Bulletin 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCastro, Eddee RH. "Finally, Free but Quality Pre-school Education." Manila Bulletin, 1998.
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