Grace Sitohang, S. ., and H. T. RFS. “SUPERVISION OF ENVIRONMENTAL POLLUTION BY THE ENVIRONMENTAL AGENCY OF SIAK REGENCY (CASE STUDY OF PT. INDAH KIAT PULP & PAPER TBK PERAWANG)”. 2022. International Journal Of Humanities, Social Sciences And Business (INJOSS), vol. 1, no. 2, Aug. 2022, pp. 57-64, doi:10.54443/injoss.v1i2.8.