APA (7 वां संस्करण) प्रशस्ति पत्र

Philippines. Regional Development Council, Region I. (1980). Regional development investment program: Region I, 1981-1985. RDC, Reg. I.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Philippines. Regional Development Council, Region I. Regional Development Investment Program: Region I, 1981-1985. San Fernando, La Union: RDC, Reg. I, 1980.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Philippines. Regional Development Council, Region I. Regional Development Investment Program: Region I, 1981-1985. RDC, Reg. I, 1980.