Heryandi, Yusep, Ishak Said, and Rina Herlina. “Online Teaching in Writing by Means of Slack Application”. Journal of English Education and Teaching 4, no. 1 (March 3, 2020): 49–68. Accessed May 3, 2024. https://ejournal.unib.ac.id/JEET/article/view/9989.