1. Antill, L., and T. Wood-Harper. 1985. Systems Analysis: Made Simple Computerbooks. London: Heinemann.
2. Ball, T. 2007. Political Theory and Political Science: Can This Marriage Be Saved? Theoria: A Journal of Social & Political Theory 54 (113): 1–22.
3. Beetham, D. 2012. Defining and Identifying a Democratic Deficit. In Imperfect Democracies the Democratic Deficit in Canada and the United States, ed. R. Simeon and P.T. Lenard. Vancouver and Toronto: UBC Press.
4. Berlinski, D. 1976. On Systems Analysis: An Essay Concerning the Limitations of Some Mathematical Methods in the Social, Political, and Biological Sciences. Cambridge: MIT Press.
5. Birch, A.H. 1993. Concepts and Theories of Modern Democracy, 2nd ed. London: Routledge.