Yafooz, W. M. S., E. A. Hizam, and W. A. Alromema. “Arabic Sentiment Analysis on Chewing Khat Leaves Using Machine Learning and Ensemble Methods”. Engineering, Technology & Applied Science Research 11, no. 2 (April 11, 2021): 6845–6848. Accessed July 2, 2022. https://www.etasr.com/index.php/ETASR/article/view/4026.