Lustani Samosir, Enricho Fiktorando Purba, Ledyana Dwi Mei Situngkir, Holmes Rajagukguk. 2026. “Parbahulbahul Nabolon (A Local Wisdom-Based Leadership Concept in the Batak Toba Ethnic Community)”. International Journal of Special Education 41 (10s):475-86. https://www.internationalsped.com/index.php/ijse/article/view/3675.