1. The "presidential" model implies that the Chief Executive is elected by all those members of the electoral body: Buonomo, Giampiero (2003). "Titolo V e "forme di governo": il caso Abruzzo (dopo la Calabria)". Diritto&Giustizia Edizione Online. – via Questia (subscription required)
2. George, Edwards; Warrenberg, Martin (2016). Government in America: People, Politics, and Policy, AP* Edition – 2016 Presidential Election, 17th Edition. Pearson Higher Education. p. 16. ISBN 9780134586571.
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4. Conceptual homogenization of a heterogeneous field: Presidentialism in comparative perspective". Comparing Nations: Concepts, Strategies, Substance: 72–152. 1994.
5. Nelson, Dana D. (2008). Bad for Democracy: How the Presidency Undermines the Power of the People. Minneapolis, Minnesota: University of Minnesota Press. p. 248. ISBN 978-0-8166-5677-6.
6. Sirota, David (August 22, 2008). "Why cult of presidency is bad for democracy". San Francisco Chronicle. Retrieved 2009-09-20.
7. Sundquist, James (1992). Constitutional Reform and Effective Government. Brookings Institution Press. p. 11.
8. Wilson, Congressional Government (1885), pp. 186–187.
9. Balfour. "Introduction". The English Constitution.
10. The Cabinet". The English Constitution.