Philippines. Regional Development Council, Region I. (1977). Ilocos Region (Region I) five year development plan: 1978-1982. RDC.
Citace podle Chicago (17th ed.)Philippines. Regional Development Council, Region I. Ilocos Region (Region I) Five Year Development Plan: 1978-1982. San Fernando, La Union: RDC, 1977.
Citace podle MLA (9th ed.)Philippines. Regional Development Council, Region I. Ilocos Region (Region I) Five Year Development Plan: 1978-1982. RDC, 1977.
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