Hanafi, N. H. B. ., and S. . Achoui. “Pronunciation Learning Strategies (PLS) Used by ESL Learners in Improving Their English Pronunciation: A Case Study”. Social Science Learning Education Journal, vol. 6, no. 04, Apr. 2021, pp. 420-33, http://sslej.in/index.php/sslej/article/view/3463.