1 - Peter Hough, (2004), Understanding Global Security, Taylor & Francis Ltd.
2 - Barry Buzan and Lene Hansen, (2009), The Evolution of Security Studies, Cambridge Universiy Press.
3 - Barry Buzan and Ole Waever, (2003), Regions and Powers, The Structure of International Security, Cambridge Universiy Press.
4- Edward A. Kolodziej-Security and International Relations -Cambridge University Press (2005)