Zikri, Ridwan, Diah Natalisa, and Ahmad Maulana. 2026. “The Effect of Product Quality, Price, and Promotions on Gas Purchasing Decisions at PT Pertamina EP Zone 4 Prabumulih”. Eduvest - Journal of Universal Studies 6 (8):9345-61. https://doi.org/10.59188/eduvest.v6i8.53191.