1. Jurgen W. Falter: Der,Positivismusstreit` in der amerikanischen Politikwissenschaft. Opladen, Westdeutscher Verlag, 1982, S. 93
2. Dwight Waldo: Political Science: Tradition, Discipline, Progression, Science, Enterprise. In: Fred I. Greenstein/Nelson W. Polsby (Hrsg.): Handbook of Political Science. Vol. 1: Political Science. Scope and Theory. Reading/Mass., Addison-Wesley, 1975 (1–130), S. 22...
3. Harold D. Lasswell/Abraham Kaplan: Power and Society. A Framework for Political Enquiry. New Haven, Yale UP, 1957, Aufl., S. Xl.
4. Harry Eckstein: Political Theory and the Study of Politics. A Report of a Conference. APSR, 1956 (475–487), S. 476, 479.
5. Robert A. Dahl/Deane E. Neubauer (Hrsg.): Readings in Modern Political Analysis. Englewood Cliffs, Prentice Hall, 1968.