Sembiring, Tamaulina Br., Lamhot Leonard Fitri, Holil Holil, Henry Kristian Siburian, and Pandu Adi Cakranegara. 2022. “The Challenge of Customary Law Implementation in the Optimistic Law Era in Saving Healthy Indonesian Environment”. International Research Journal of Management, IT and Social Sciences 9 (4):656-65. https://doi.org/10.21744/irjmis.v9n4.2147.