Aprilikatias, and Abdul Madjid Latief. “Implementasi Konsep Eco-Office Di Kantor Pusat PT. Pertamina (Persero)”. Jurnal Utilitas 4, no. 1 (February 17, 2020): 1–8. Accessed November 25, 2024. https://journal.uhamka.ac.id/index.php/utilitas/article/view/4684.