4CLAES FORNELL, MICHAELDJOHNSON, EUGENE WETC. The American Customer Satisfaction Index: Nature, Purpose, and Findings[J]. Journal of Marketing, 1996 (60) : 7 - 18.
5PARASURAMAN A, ZEITHAML VA, BERRY LL. A conceptual model of service quality and its implications for future research[J]. Journal of" Marketing, 1985,49 (3) : 41 -51.