Philippines. Regional Development Council, Region I. (2008). Region 1: Ilocos-Pangasinan updated regional development plan, 2008-2010. RDC I.
Chicago-viite (17. p.)Philippines. Regional Development Council, Region I. Region 1: Ilocos-Pangasinan Updated Regional Development Plan, 2008-2010. San Fernando, La Union: RDC I, 2008.
MLA-viite (9. p.)Philippines. Regional Development Council, Region I. Region 1: Ilocos-Pangasinan Updated Regional Development Plan, 2008-2010. RDC I, 2008.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.