Pipatpongumpai, Arthitiya, Tatre Jantarakolica, Korbkul Jantarakolica, Woraphon Wattanatorn, Thanomsuk Suwannoi, and Massaporn Cheuathonghua Massaporn Cheuathonghua. 2022. “Factors Influencing the Purchase Intention of Online Learning Courses”. Journal of Research and Development Institute Rajabhat Maha Sarakham University 9 (3):223-40. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/259075.