Ashraful Islam, and Laila Akhter. “A Conceptual Framework for Designing an E-Portfolio System to Enhance Malaysian Skills Certification Processes”. International journal of multivariate data analysis theory & practice 6, no. 01 (August 15, 2021): 7–13. Accessed July 21, 2026. https://scientiamreearch.org/index.php/ijmdatp/article/view/435.