Crisostomo, I. T. (2001). Writing books is hard but rewarding. Philippine Star.
Lua i Stíl Chicago (17ú heag.)Crisostomo, Isabelo T. "Writing Books Is Hard but Rewarding." Philippine Star 2001.
Lua MLA (9ú heag.)Crisostomo, Isabelo T. "Writing Books Is Hard but Rewarding." Philippine Star, 2001.
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