Issaro, S., T. Areepong, J. Karapakdee, S. Srisawat, W. Jinwan, and A. Siripan. “Blockchain-Based Credit Transfer for Higher Education Institutions”. International Journal of Educational Communications and Technology, vol. 2, no. 2, Sept. 2022, pp. 46-60, https://ph01.tci-thaijo.org/index.php/IJECT/article/view/248546.