Melanie, M., and D. Febriyanti. “Influence Net Profit Margin, Debt to Equity Ratio, Return on Assets and Current Ratio Against Effective Tax Rate: (In Sub Sector Companies Coal Mining Companies Listed on the Indonesia Stock Exchange 2016-2023)”. International Journal of Community Service & Engagement, vol. 6, no. 1, Feb. 2025, pp. 24 -7, doi:10.47747/ijcse.v6i1.2645.