Heri, Rahayu Dwi Utami, and Abdi Syahrial Harahap. “Speech Development in Early Childhood Reviewed from Urban and Rural Environments”. International Conference Epicentrum of Economic Global Framework (February 13, 2026): 3371–3379. Accessed November 14, 2026. https://proceeding.pancabudi.ac.id/index.php/ICEEGLOF/article/view/1920.