Perez, F. A., & Fox, E. (1988). Igorots: Geographic and ethnographic study of some districts of Northern Luzon. Cordillera Studies Center, University of the Philippines.
Chicago-referens (17:e uppl.)Perez, Fray Angel, och Enriqueta Fox. Igorots: Geographic and Ethnographic Study of Some Districts of Northern Luzon. Baguio City: Cordillera Studies Center, University of the Philippines, 1988.
MLA-referens (9:e uppl.)Perez, Fray Angel, och Enriqueta Fox. Igorots: Geographic and Ethnographic Study of Some Districts of Northern Luzon. Cordillera Studies Center, University of the Philippines, 1988.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.