Margrettha Is Sirait, Yevana Arthika Hutagaol, Putra Pranata Simanjuntak, and Anita Sitanggang. “A Contrastive Analysis Of Vowel In Indonesian and English”. PIJAR: Jurnal Pendidikan dan Pengajaran 1, no. 3 (August 30, 2023): 400–406. Accessed April 27, 2026. https://putrapublisher.org/index.php/pijar/article/view/392.