Wanotayapitak, Sukosol, Kobkiat Saraubon, and Prachyanun Nilsook. “Process Design of Cooperative Education Management System by Cloud-Based Blockchain E-Portfolio”. International Journal of Online and Biomedical Engineering (iJOE) 15, no. 08 (May 14, 2019): pp. 4–17. Accessed May 2, 2024. https://online-journals.org/index.php/i-joe/article/view/10374.