1. Jakub Grygiel, Great Powers and Geopolitical Change, John Hopkins University Press, 2006, pp. 24–25
2. Phil Kelly, Classical Geopolitics: A New Analytical Model, Stanford University Press, 2016, p. 10
3. Ishaan Tharoor, ‘What an actual ‘deep state’ looks like’, The Washington Post, March 7, 2017
4. Jacob Klein, Lectures and Essays, St John’s College Press, 1985, p. 306
5. Patrick Jackson, ‘Foregrounding ontology; dualism, monism and IR theory’, Review of International Studies, Vol. 34, No 1, January 2008, pp. 129–153, p. 133