Philippines. Regional Development Council. (1986). Medium-term Ilocos Region development plan, 1987-1992. Regional Development Council.
Cita Chicago (17th ed.)Philippines. Regional Development Council. Medium-term Ilocos Region Development Plan, 1987-1992. San Fernando, La Union: Regional Development Council, 1986.
Cita MLA (9th ed.)Philippines. Regional Development Council. Medium-term Ilocos Region Development Plan, 1987-1992. Regional Development Council, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.