“A Contrastive Analysis of the Production of English and Yoruba Vowels by Yoruba-English Bilingual Students in University of Nigeria, Nsukka”. Global Journal of Human-Social Science 21, no. G6 (May 15, 2021): 29–36. Accessed June 8, 2026. https://socialscienceresearch.org/index.php/GJHSS/article/view/3648.