Azahar, T. M., I. Abu Seman, A. H. Darusman, and N. Ibrahim. “Assessment of Basal Stem Rot Disease Distribution in Palm Oil Plantation Using Geographical Information System”. Journal of Science and Technology, Vol. 6, no. 2, Dec. 2014, https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/922.