Yamusa, Y. B., R. Sa’ari, K. Ahmad, N. Alias, M. Mustaffar, and L. K. Foong. “Monitoring Leachate Migration in Compacted Soil Using Digital Image Technique”. Engineering, Technology & Applied Science Research 9, no. 1 (February 16, 2019): 3685–3691. Accessed January 27, 2022. https://www.etasr.com/index.php/ETASR/article/view/2407.