Saifuddin, M., N. Osman, R. M. Idris, and A. Halim. “The Effects of Pre-Aluminum Treatment on Morphology and Physiology of Potential Acidic Slope Plants”. Kuwait Journal of Science, vol. 43, no. 2, May 2016, https://journals.ku.edu.kw/kjs/index.php/KJS/article/view/960.