Yusuf, Darmawan. “Legal Certainty of Wage Determination as the Basis for Calculating BPJS Employment Contributions and Its Implications for Employer Accountability in North Sumatra”. Adagium: Jurnal Ilmiah Hukum 4, no. 2 (Oktober 31, 2026): 1744–1760. Diakses November 6, 2026. https://ejournal.mejailmiah.com/index.php/adagium/article/view/741.