Agnew John, "Geopolitics re-vision world politics," Routledge Taylor & Francies Group, pp 1-5
Alan Taylor, American Colonies: New York: Viking, 2001, pp. 57 -- 8.
Baldwin, David. Ed. Neo-Realism And Neoliberalism: The Contemporary Debate, New York: Columbia University Press, 1993.
Balzacq, T. (Ed.). Understanding securitization theory. The design and evolution of security problems. Oxon: Routledge, 2010.