Ople, B. F. (1997). The outstanding teachers. IN Horizons [column]. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Ople, Blas F. "The Outstanding Teachers. IN Horizons [column]." Manila Bulletin 1997.
Lua MLA (9ú heag.)Ople, Blas F. "The Outstanding Teachers. IN Horizons [column]." Manila Bulletin, 1997.
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