1. External search effort;Beatty;Journal of Consumer Research,1986
2. Benzecri, J. P. (1979). Practical aspects of correspondence analysis. In Bulletin de l'ADDAD (6th ed.) (pp. 45–55). Paris: Association pour le Development et la Diffusion de l'Analyse des Donnees Laboratoire de Statistique Tour.
3. Consumer search: An extended framework;Bloch;Journal of Consumer Research,1986
4. Consumer behavior;Engel,1990
5. The use of requested promotional material by pleasure travelers;Etzel;Journal of Travel Research,1985