(1997). PNB at 81: Renewed strength, renewed commitment. Manila Bulletin.
Chicago Style aipamena"PNB at 81: Renewed Strength, Renewed Commitment." Manila Bulletin 1997.
MLA aipamena"PNB at 81: Renewed Strength, Renewed Commitment." Manila Bulletin, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.