1. Disparity analysis: a double-edged sword;Blake;Marketing News 13 January,1986
2. What the American Hotel and Motel Association learned from its quest for quality;Collins,1986
3. Managing customer satisfaction in consumer service businesses;Czepiel,1980
4. A service quality model and its marketing implications;Gronroos;European Journal of Marketing,1984
5. Defining quality for a quality assurance program — a study of perceptions;Nightingale,1986