1. Kotarbiński, T. 1960. The Concept of Action. The Journal of Philosophy 57(7): 215–222.
2. ———. 1965. Praxiology. An Introduction to the Science of Efficient Action. Warsaw: PWN.
3. ———. 1966. Gnosiology. The Scientific Approach to the Theory of Knowledge. Oxford: Pergamon Press.
4. ———. 1983 The Goal of an Act and the Task of the Agent [orig. 1913]. In Praxiological Studies. Polish Contributions to the Science of Efficient Action, eds. W. Gasparski, T. Pszczołowski, 1–18. Warsaw: PWN.
5. ———. 1990a. Dzieła wszystkie: Prakseologia [Collected Works: Praxiology]. Vol. I. Ossolineum: Wrocław.