APA (7 वां संस्करण) प्रशस्ति पत्र

(1997). PNB at 81: Renewed strength, renewed commitment. Manila Bulletin.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

"PNB at 81: Renewed Strength, Renewed Commitment." Manila Bulletin 1997.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

"PNB at 81: Renewed Strength, Renewed Commitment." Manila Bulletin, 1997.