Budiman, N. A. S. ., and I. Ramadhan. “Defining European Union’s Energy Security from the Perspective of 4A (Availability, Accessibility, Acceptability, Affordability) As an Impact from Russia-Ukraine’s Conflict”. Journal of International Studies on Energy Affairs, vol. 5, no. 1, July 2024, pp. 57-79, doi:10.51413/jisea.Vol5.Iss1.2024.57-79.