B. Nababan and S. Siagian, “Empowering Teachers’ Professional Competence through the PIKOLAK Training Model (Participatory, Integrative, and Collaborative) with a Blended Learning Approach in Humbang Hasundutan Regency”, J. Humanities Educ. Dev., vol. 7, no. 6, pp. 93–101, Dec. 2025, doi: 10.22161/jhed.7.6.10.