Kangatharan, Jayanthiny, Anastasia Giannakopoulou, and Maria Uther. “The Effect of HVP Training in Vowel Perception on Bilingual Speech Production”. Research in English Language Teaching 2, no. 1 (March 10, 2021): 15–32. Accessed May 4, 2024. https://archive.conscientiabeam.com/index.php/179/article/view/2574.