Kristensen, K., Kanji, G. & Dahlgaard, J. J. (1992). On measurement of customer satisfaction. Total Quality Management & Business Excellence (Print Edition), 3(2), 123-128.
Sørensen, E. & Grunert, K. G. (1994). Identification of managers' perceived key succes factors. I Proceedings of the 2nd International Workshop on Managerial and Organizational Cognition / C. Eden & B. Winterscheid (Eds.) (s. s. 541-565). European Institute for Advanced Studies in Management.