Kwansud, P. ., and P. . Compan. “Purchasing Behaviors of Online Tutoring Courses of Senior High School Students in Extra-Large Schools in Nakhon Si Thammarat Province”. Science, Technology, and Social Sciences Procedia, vol. 2023, no. 4, Dec. 2023, p. CiM13, https://wjst.wu.ac.th/index.php/stssp/article/view/25805.