Philippines. Regional Development Council, Region I. (1980). Regional development investment program: Region I, 1981-1985. RDC, Reg. I.
Cita Chicago (17th ed.)Philippines. Regional Development Council, Region I. Regional Development Investment Program: Region I, 1981-1985. San Fernando, La Union: RDC, Reg. I, 1980.
Cita MLA (9th ed.)Philippines. Regional Development Council, Region I. Regional Development Investment Program: Region I, 1981-1985. RDC, Reg. I, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.