Grace Sitohang S, RFS HT. SUPERVISION OF ENVIRONMENTAL POLLUTION BY THE ENVIRONMENTAL AGENCY OF SIAK REGENCY (CASE STUDY OF PT. INDAH KIAT PULP & PAPER TBK PERAWANG). INJOSS [Internet]. 2022 Aug. 8 [cited 2026 Mar. 19];1(2):57-64. Available from: https://www.injoss.socian.my.id/index.php/joss/article/view/8