Tumangger, Henni N., Martahadi Mardhani, and Iskandar. “The Impact of Demographic Variables on Economic Growth in North Sumatra, Indonesia”. International Journal of Advances in Social Sciences 1, no. 1 (February 15, 2024): 9–14. Accessed July 26, 2025. https://pelitapublishing.com/index.php/ijass/article/view/5.