Syarfina, Tengku, and Maysarah Siregar. “Formant Analysis in Native and Non-Native Speakers”. EduInovasi: Journal of Basic Educational Studies 4, no. 1 (December 27, 2023): 712 -. Accessed November 15, 2024. https://journal.laaroiba.com/index.php/eduinovasi/article/view/5896.