Grace Sitohang, S. ., & RFS , H. T. (2022). SUPERVISION OF ENVIRONMENTAL POLLUTION BY THE ENVIRONMENTAL AGENCY OF SIAK REGENCY (CASE STUDY OF PT. INDAH KIAT PULP & PAPER TBK PERAWANG). International Journal Of Humanities, Social Sciences And Business (INJOSS), 1(2), 17–24. Retrieved from https://www.injoss.socian.my.id/index.php/joss/article/view/8