F. Harahap and M. Zakaria, “The Analysis of the Implementation of EMS ISO 14001:2015 Based on the Global Environmental Management Initiative at PT Pertamina Hulu Rokan Zone I Pangkalan Susu Field”, Proc. Int. Conf. Multidiscip. Eng. (ICOMDEN), vol. 2, p. 00072, Jan. 2025.