5Parasuraman A, Berry L L, Valarie A, Zeithaml. More on improving service quality measurement. Journal of Retailing, 1993, 69:40-47.
6Robert J. The zone of tolerance: Exploring the relationship between service transactions and satisfaction with the overall service. International Journal of Service Industry Management, 1995, 2: 46- 61.
7Nonyelu G, Nwokoye. An experimental study of the relationship between responses to price changes and the price level for shoes. Advances in Consumer Research, 1975, 2:693-704.
8Anderson E W. Customer satisfaction and price tolerance. Marketing Letters, 1996, 3:265-274.