Kadaruddin, Burhanuddin Arafah, Kaharuddin, Djuwairiah Ahmad, Iska. 2020. “Word Wall Media: An Effective Teaching Technique to Enrich Students’ Vocabulary in Secondary Level of Education”. International Journal of Advanced Science and Technology 29 (05), 13228-42. http://sersc.org/journals/index.php/IJAST/article/view/25955.