Octaberlina, L. R. ., A. I. . Muslimin, and I. . Rofiki. “An Investigation on the Speaking Constraints and Strategies Used by College Students Studying English As EFL Learners”. International Journal of Learning, Teaching and Educational Research, vol. 21, no. 9, Sept. 2022, pp. 232-49, https://ijlter.net/index.php/ijlter/article/view/1415.