1. Pörn, I.: The Logic of Power. Basil Blackwell, Oxford (1970)
2. Pörn, I.: Elements of Social Analysis. Philosophical Studies published by the Department of Philosophy at the University of Uppsala, Sweden, No. 10 (1971)
3. Pörn, I.: Some Basic Concepts of Action. In: Stenlund, S. (ed.) Logical Theory and Semantic Analysis. Essays Dedicated to Stig Kanger on his Fiftieth Birthday. Synthese Library, vol. 63, pp. 93–101. D. Reidel Publishing Company, Dordrecht (1974)
4. Pörn, I.: A Remark on Determinism and Agency. In: Kausalitet, pp. 69–70. Proceedings edited by the Department of Philosophy. University of Oslo, Norway (1976)
5. Pörn, I.: Action Theory and Social Science – Some Formal Models. Synthese Library, vol. 120. D. Reidel Publishing Company, Dordrecht (1977)