Zarkasih , Muhamad. “Conceptual Paper: Digital Image Processing for KPI of ‘Office Boy’ Employee”. Proceedings of the Informatics Conference 6, no. 11 (January 5, 2021): 14–22. Accessed February 11, 2026. https://ojs.journals.unisel.edu.my/index.php/icf/article/view/78.