Ople, B. F. (1997). Why the attempt to change the charter is doomed. IN Horizons [column]. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOple, Blas F. "Why the Attempt to Change the Charter Is Doomed. IN Horizons [column]." Manila Bulletin 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रOple, Blas F. "Why the Attempt to Change the Charter Is Doomed. IN Horizons [column]." Manila Bulletin, 1997.
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