Valera, E. (2016) “PRESERVING THE TINGUIAN CULTURAL HERITAGE: MOTHER TONGUE-BASED MULTI-LINGUAL EDUCATION AS TOOL: Preserving cultural heritage; Tinguian; Ilocano; First Language; Mother Tongue-Based Multi- lingual Education”, Journal Sampurasun : Interdisciplinary Studies for Cultural Heritage, 2(1), p. 79. doi: 10.23969/sampurasun.v2i01.123.