Chiraratanasopha, Boonthida. “Sentimental Analysis and Keyword Extraction from Thai Users of Facebook in COVID-19 Period”. Progress in Applied Science and Technology 11, no. 1 (March 26, 2021): 66–72. Accessed May 4, 2024. https://ph02.tci-thaijo.org/index.php/past/article/view/243241.