จุลปานนท์ ว. . (2020) “European Union’s Crisis : Lessons for ASEAN ”, Ramkhamhaeng Research Journal of Humanities and Social Science, 23(2), pp. 16–25. available at: https://so05.tci-thaijo.org/index.php/rusoc/article/view/248885 (accessed: 4 April 2025).