1. 11. Garvin, D.A. “What Does Product Quality Really Mean?”, Sloan Management Review, Fall1984, pp. 25‐43.
2. 12. Parasuraman, A., Zeithaml, V.A. and Berry, L.L. “SERVQUAL: A Multiple‐Item Scale for Measuring Consumer Perceptions of Service Quality”, Journal of Retailing, Vol. 64 No. 1, Spring 1988, pp. 12‐40.