Rajendran, Thirumangai, and Melor Md Yunus. “A Systematic Literature Review on the Use of Mobile-Assisted Language Learning (MALL) for Enhancing Speaking Skills Among ESL and EFL Learners”. International Journal of Academic Research in Progressive Education and Development, vol. 10, no. 1, Mar. 2021, https://ijarped.com/index.php/journal/article/view/2256.