Nababan, Benyamin, Sahat Siagian, Abdul Hamid, and Holmes Rajagukguk. “Developing a Participatory, Integrative, and Collaborative Competency-Based Training Model (PIKOLAK) through Blended Learning to Enhance the Teachers’ Professional Competence”. SALTeL Journal (Southeast Asia Language Teaching and Learning) 8, no. 1 (July 31, 2025): 12–18. Accessed October 10, 2026. https://www.journal.altsacentre.org/index.php/SALTeL/article/view/128.