Lubis, A. A., and S. Tirtayasa. “Impact of Education and Training on Employee Performance at the North Sumatra Center for Teachers and Educational Personnel (BBGTK)”. Digital Business: Tren Bisnis Masa Depan, vol. 17, no. 2, June 2026, pp. 24-31, https://ejournal.cria.or.id/index.php/db/article/view/429.