Valera, Elizabeth. “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, no. 1 (October 17, 2016): 79. Accessed March 3, 2026. https://journal.unpas.ac.id/index.php/sampurasun/article/view/123.