Philippines. Regional Development Council, Region I. (1980). Regional development investment program: Region I, 1981-1985. RDC, Reg. I.
Lua i Stíl Chicago (17ú heag.)Philippines. Regional Development Council, Region I. Regional Development Investment Program: Region I, 1981-1985. San Fernando, La Union: RDC, Reg. I, 1980.
Lua MLA (9ú heag.)Philippines. Regional Development Council, Region I. Regional Development Investment Program: Region I, 1981-1985. RDC, Reg. I, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.