Bunyavejchewin, P. “Theories of International Politics after the Incident of 9/11: The Richness and Weakness of Realist Tradition in the Twentieth-First Century”. Kasetsart Journal of Social Sciences, vol. 33, no. 1, Apr. 2012, pp. 161-9, https://so04.tci-thaijo.org/index.php/kjss/article/view/246806.