Abra, the Itnegs’ territory, lies in between the provinces of Ilocos Norte, Ilocos Sur, Mountain Province, Kalinga, and Apayao. Their economic activities include swidden farming, fishing, and hunting; their staple crop is rice (planted using both dry and wet methods). Itneg villages are usually composed of around 50 households, all of whom are related to each other.
The language and dialects of the Inlaod Itnegs have quite a number of lexical similarities to the Ilocano language, which is their second language. The Inlaod Itnegs are found in Peñarrubia, Langiden, Danglas, and Lagangilang.
Lewis, M. Paul (ed.), 2009. Ethnologue: Languages of the World, Sixteenth edition. Dallas, Tex.: SIL International. Online version: http://www.ethnologue.com/
Dumagat, Fay. 1996. Itneg (Tinggian) Justice & Conflict Resolution. Quezon City: New Day Publishers.
Cole, Fay-Cooper. 1922. The Tinguian: Social, Religious and Economic Life of a Philippine Tribe. Chicago: Field Museum of Natural History.