IKUPA, Joseph Obaro and EJIE Ifelunwa Margaret, “Learning Problems in the Use of English Vowels by Ukwuani and Urhobo Users of English”, Int. J. Res. Edu. Sus. Dev., vol. 4, no. 5, pp. 84–99, May 2024, Accessed: Sep. 18, 2024. [Online]. Available: https://www.openjournals.ijaar.org/index.php/ijresd/article/view/558