Berthanica Yohana, Rien Safrina, and Erlinda Yetti. “Intonation and Articulation: An Early Childhood Vocalization Method”. International Journal of Educational Research 2, no. 2 (June 17, 2025): 80–85. Accessed June 27, 2025. https://international.aripi.or.id/index.php/IJER/article/view/322.