Lustani Samosir, Enricho Fiktorando Purba, Ledyana Dwi Mei Situngkir, Holmes Rajagukguk. “Parbahulbahul Nabolon (A Local Wisdom-Based Leadership Concept in the Batak Toba Ethnic Community)”. International Journal of Special Education 41, no. 10s (June 29, 2026): 475–486. Accessed October 21, 2026. https://www.internationalsped.com/index.php/ijse/article/view/3675.