Devia, Della, Puji Lestari, and Emenda Sembiring. “Life Cycle Assessment (LCA) Produk Semen Portland Komposit (Studi Kasus: PT X)”. Jurnal Teknik Lingkungan 23, no. 2 (October 1, 2017): 1–10. Accessed February 4, 2026. https://www.envengjournal.com/index.php/jtl/article/view/245.