1. Beesley, I. (2017). The Official History of the Cabinet Secretaries. London and New York: Routledge.
2. Blackwell, N. (2000, November 22). Evidence of Lord Blackwell to the Public Administration Select Committee. https://publications.parliament.uk/pa/cm199900/cmselect/cmpubadm/727/0112203.htm, 4 May 2017.
3. Blick, A. (2004). People Who Live in the Dark. London: Politico’s Publishing.
4. Blick, A., & Jones, G. (2013). At Power’s Elbow: Aides to the Prime Minister from Robert Walpole to David Cameron. London: Biteback Publishing.
5. Bose, M. (2006). What Makes a Great President? An Analysis of Leadership Qualities in Fred I. Greenstein’s the Presidential Difference. In L. Berman (Ed.), The Art of Political Leadership: Essays in Honor of Fred I. Greenstein (2005). Lanham: Rowman & Littlefield Publishers.