Horario, R. A. (2012). Resign, Sen. Cayetano challenges lead prosecutor Tupas. Manila Times.
Lua i Stíl Chicago (17ú heag.)Horario, Ritchie A. "Resign, Sen. Cayetano Challenges Lead Prosecutor Tupas." Manila Times 2012.
Lua MLA (9ú heag.)Horario, Ritchie A. "Resign, Sen. Cayetano Challenges Lead Prosecutor Tupas." Manila Times, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.