Ramadhan DD, Kusumawati R, Oktaviani T. Business Strategy: Analisis Lingkungan Eksternal PT Pertamina Hulu Energi Tbk. PSM [Internet]. 2024 Jun. 18 [cited 2024 Dec. 22];3(2):2084-93. Available from: https://openjournal.unpam.ac.id/index.php/PSM/article/view/41000