Casayuran, M. B. (2002). Drilon clears COPA leadeers of conspiracy. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Casayuran, Mario B. "Drilon Clears COPA Leadeers of Conspiracy." Manila Bulletin 2002.
Lua MLA (9ú heag.)Casayuran, Mario B. "Drilon Clears COPA Leadeers of Conspiracy." Manila Bulletin, 2002.
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