“A Contrastive Analysis of the Production of English and Yoruba Vowels by Yoruba-English Bilingual Students in University of Nigeria, Nsukka”, GJHSS, vol. 21, no. G6, pp. 29–36, May 2021, Accessed: Jun. 13, 2026. [Online]. Available: https://socialscienceresearch.org/index.php/GJHSS/article/view/3648