4Philip Kotler, Kevin Lane Keller,<Marketing Management>, Pretice Hall, 2005
5N.Kano,<Attractive Quality and Must-be Quality> , The Journal of the Japanese Society for Quality Control, 1984, 14(2)
6A. Parasuraman, V.A.Zeithaml, L.L.Berry,<A Conceptual Model of Service Quality and Its Implication for Future Research>, Journal of Marketing, 1985,49(4)
7C.Gronroos,<Innovative Marketing Strategies and Organization Structures for Service Firm>,Emerging Persoectives on Services Marketing, AMA, 1983