Indupurnahayu, Indupurnahayu, Edhie Budi Setiawan, Lira Agusinta, Ryan Firdiansyah Suryawan, Prasadja Ricardianto, Mustika Sari, Sri Mulyono, and Reza Fauzi Jaya Sakti. 2021. “Changes in Demand and Supply of the Crude Oil Market During the COVID-19 Pandemic and Its Effects on the Natural Gas Market”. International Journal of Energy Economics and Policy 11 (3):1-6. https://www.econjournals.com/index.php/ijeep/article/view/10671.