Persada, Satria Fadil, Andri Oktavianto, Bobby Miraja, Reny Nadlifatin, Prawira Fajarindra Belgiawan, and A.A.N Perwira Perwira Redi. “Public Perceptions of Online Learning in Developing Countries: A Study Using The ELK Stack for Sentiment Analysis on Twitter”. International Journal of Emerging Technologies in Learning (iJET) 15, no. 09 (May 15, 2020): pp. 94–109. Accessed April 25, 2024. https://online-journals.org/index.php/i-jet/article/view/11579.