Castro, E. R. (1998). Outstanding scientists cited by Nat'l Academy. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCastro, Eddee RH. "Outstanding Scientists Cited by Nat'l Academy." Manila Bulletin 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCastro, Eddee RH. "Outstanding Scientists Cited by Nat'l Academy." Manila Bulletin, 1998.
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