1. Brumec, J., (1996), A contribution to IS general taxonomy, Proceedings of The 7
th
International Conference “Information Systems 96”, pp. 95–105, Varazdin, 1996.
2. Daniels, C.N., (1994), “Information Technology - The Management Challenge”, Addison-Wesley Publishing Company, New York.
3. Drummond, I., (1992), “Estimating with Mk II Function Point Analysis”, Information Systems Engineering Library, CCTA, London.
4. Ein-Door, P., and Segev, E., (1993), A classification of information systems: analysis and interpretation, Information Systems Research, 4(2), pp. 166–204.
5. Haberfellner, R., (1974), “Die Unternehmung als dynamisches System”, Verlag Industrielle Organisation, Zuerich.