1. Autry, P., and Thomas, D., 1986. Competitive Strategy in the Hospital Industry. Health Care Management Review, 11(no. 7), pp. 7–14.
2. Lamont, B.T., Marlin, D., and Hoffman, J.J., 1993. Porter’s Generic Strategies, Porter s strategy low cost and differ.
3. Barney, J. (1991), ‘Firm Resources and Sustained Competitive Advantage’, Journal of Management, 17(1): 99–120.
4. Grant, R. M. (2013). Contemporary Strategy Analysis, 8th Edition, chapter 7 The sources and dimensions of competitive advantage, page 171–172.
5. Ghemawat, P. and Rivkin, JW. (2006), Creating Competitive Advantage, Harvard Business School note #9-798-062.