Cleto, R. B., Dehn, C. H., & Padilla, H. J. (1986). The Ilocos and Cordillera provinces: A general physical and socio-economic profile. Katinnulong Daguiti Umili Iti Amianan, Inc. (KADUAMI) Sibol ng Agham at Akmang Teknolohiya (SIBAT), National Secretariat.
Chicago-referens (17:e uppl.)Cleto, Romeo B., Christoph H. Dehn, och Hilario J. Padilla. The Ilocos and Cordillera Provinces: A General Physical and Socio-economic Profile. Baguio City [Philippines], Manila: Katinnulong Daguiti Umili Iti Amianan, Inc. (KADUAMI) Sibol ng Agham at Akmang Teknolohiya (SIBAT), National Secretariat, 1986.
MLA-referens (9:e uppl.)Cleto, Romeo B., et al. The Ilocos and Cordillera Provinces: A General Physical and Socio-economic Profile. Katinnulong Daguiti Umili Iti Amianan, Inc. (KADUAMI) Sibol ng Agham at Akmang Teknolohiya (SIBAT), National Secretariat, 1986.