Heydari, Mobina, and Majid Pourmohammadi. “The Effect of Live Teacher Pronunciation Vs. Playback Pronunciation Practice OnPre-Intermediate Iranian EFL Learners’ Pronunciation Accuracy”. International Journal of English and Education, vol. 6, no. 1, Jan. 2017, pp. 59-67, https://ijee.org/ijee/article/view/276.