Echeminada, P. (1997). Valdez on Charter change: Joke only. Philippine Star.
Chicago Style aipamenaEcheminada, Perseus. "Valdez on Charter Change: Joke Only." Philippine Star 1997.
MLA aipamenaEcheminada, Perseus. "Valdez on Charter Change: Joke Only." Philippine Star, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.