Alfino, J, M Adnan Latief, U Widiati, and A Saukah. “Randomized Group Vs Heterogeneous Group in Developing EFL Argumentative Essay”. KnE Social Sciences 3, no. 15 (March 31, 2019): 249–259. Accessed May 5, 2024. https://knepublishing.com/index.php/KnE-Social/article/view/4371.