1. Air Force Space Command. (n.d.). Air Force Space Command: About Us: Heritage: 1980s–1990s. Retrieved 12 13, 2018, from
https://www.afspc.af.mil/About-Us/Heritage/1980s-1990s/
.
2. Al-Rodhan, N. R. (2012). Meta-geopolitics of outer space. London: Palgrave Macmillan.
3. Barkey, K., & Parikh, S. (1991). Comparative perspective on the state. International Review of Sociology, 17(2), 523–549.
4. Barnett, M., & Duvall, R. (2005). Power in international politics. International Organization, 59(1), 39–75.
5. Blalock, H. M. (1989). Power and conflict: Toward a general teory. Newbury Park, CA: Sage.