Philippines. National Economic and Development Authority. (1987). Ilocos Region mid-year regional development report, CY 1987. National Economic and Development Authority.
Chicago-referens (17:e uppl.)Philippines. National Economic and Development Authority. Ilocos Region Mid-year Regional Development Report, CY 1987. San Fernando, La Union: National Economic and Development Authority, 1987.
MLA-referens (9:e uppl.)Philippines. National Economic and Development Authority. Ilocos Region Mid-year Regional Development Report, CY 1987. National Economic and Development Authority, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.