Echeminada, P. (1997). Valdez on Charter change: Joke only. Philippine Star.
Chicago-čujuhus (17. p.)Echeminada, Perseus. "Valdez on Charter Change: Joke Only." Philippine Star 1997.
MLA-čujuhus (9. p.)Echeminada, Perseus. "Valdez on Charter Change: Joke Only." Philippine Star, 1997.
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