Marfil, M. (1999). Estrada to push Cha-cha even if ratings fall to zero. Philippine Daily Inquirer.
Chicago Style aipamenaMarfil, Martin. "Estrada to Push Cha-cha even if Ratings Fall to Zero." Philippine Daily Inquirer 1999.
MLA aipamenaMarfil, Martin. "Estrada to Push Cha-cha even if Ratings Fall to Zero." Philippine Daily Inquirer, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.