Tambunan, Sihar Tigor Benjamin. “KERANGKA KERJA PENILAIAN INVESTASI LINGKUNGAN (ENVIRONMENTAL PERFORMANCE APPRAISAL)”. Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri 9, no. 2 (January 31, 2008): 152-160. Accessed April 29, 2024. https://jurnalindustri.petra.ac.id/index.php/ind/article/view/16715.