1. Aaker, D. A.; Kumar, V. Day, G. S.: Marketing research ( 6th ed. ). New York, Chichester, Weinheim: 1998.
2. Allport, F. H.: Theories of perception and the concept of structure. New York: 1955.
3. Ajzen, I. Fishbein, M. (eds.): Understanding attitudes and predicting behavior. Englewood Cliffs: 1980.
4. Bänsch, A.: Käuferverhalten. München, Wien: 1993.
5. Barker, R. G. Wright, H. F.: Midwest and its children. Hamden: 1971.