1. Bedny G, Meister D 1997.The Russian Theory of Activity: Current Applications to Design and Learning. Series in Applied Psychology. Mahwah, NJ: Lawrence Erlbaum Publishers.
2. Hasan H 1998. Activity theory: A basis for the contextual study of information systems in organisations. In: H Hasan, E Gould, PN Hyland (Eds.):InformationSystems and Activity Theory: Tools in Context. Wollongong: University of Wollongong Press, pp. 19-38.
3. Leont’ev AN 1981.Problems of the Development of the Mind. Moscow: Progress.
4. Polit DF, Beck CT 2008.Nursing Research: Generatingand Assessing Evidence for Nursing Practice. Philadelphia: Lippincott Williams and Wilkins.
5. Wartofsky MW 1979. Perception, representation, and the forms of action: Towards a historical epistemology. In: RS Cohen, MW Wartofsky (Eds.):Models, Representation and the Scientific Understanding. Dordrecht, Boston: D. Reidel Publishing Co., pp. 188-209.