Andi Dwi Wulandari, Muh. Ichwan Musa, Nurman, Anwar Ramli, and Hety Budiyanti. “Analysis of Investment Risk and Share Return in Coal Mining Companies Listed on IDX for The Period 2019-2021”. Economics and Business Journal (ECBIS), vol. 1, no. 4, May 2023, pp. 247-56, doi:10.47353/ecbis.v1i4.34.