Tambunan, Elya, and Zainarti Zainarti. “Analysis of Service Quality Levels for Social Security Administrator (BPJS) Participants and Non-BPJS (Case Study of Ofa Padang Mahondang Village)”. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE) 6, no. 3 (August 1, 2023): 1500-1518. Accessed May 28, 2026. https://e-journal.uac.ac.id/index.php/iijse/article/view/3775.