A. Pipatpongumpai, T. Jantarakolica, K. Jantarakolica, W. Wattanatorn, T. Suwannoi, and M. C. Massaporn Cheuathonghua, “Factors Influencing the Purchase Intention of Online Learning Courses”, JDSC, vol. 9, no. 3, pp. 223–240, Dec. 2022.