1. Aggarwal, P. (1976). Political Theory: Principles of Political Science. S Chand & Company Ltd.
2. Aggarwal, P. (2014, November 16). Distinction between Political Theory and Political Thought. Academike.
3. Allen, J. W. (1960). A History of Political Thought in the Sixteenth Century.Methuen.
4. Ajayi, G. (2007). The military and the Nigerian state, 1966–1993: A study of the strategies of political power control. Africa World Press.
5. Anselm H. Amadio Chaplain (1970). Instructor in Philosophy, Illinois Institute of Technology, Chicago. Staff Writer, Philosophy and Religion, Encyclopædia Britannica, Chicago, 1970–73.