Khattak, M. A. ., M. A. . Haziq Ayoub, M. A. F. . Abdul Manaf, . M. F. . Mahru, M. R. . Mohd Juhari, . M. I. . Mustaffa, and S. . Kazi. “Global Energy Security and European Union: A Review”. Journal of Advanced Research in Applied Sciences and Engineering Technology, vol. 11, no. 1, Dec. 2020, pp. 64-81, https://akademiabaru.com/submit/index.php/araset/article/view/1961.