Ortigueza, M., G. Fernandez, M. Ulbinar, F.J. Mon, A.L. Quintal, and Franklin A. Sison, MBA. “An Office Procedure Study of Human Resource and Billing Department in MNO Company”. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research 1, no. 1 (April 1, 2019). Accessed May 8, 2024. https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/1904.