1. Scanning the business environment;Aguilar,1967
2. Business marketing: Understand what customers value;Anderson;Harvard Business Review,1998
3. Corporate strategy: An analytic approach to business policy for growth and expansion;Ansoff,1965
4. Firm resources and sustained competitive advantage;Barney;Journal of Management,1991
5. Qualitative case study methodology: Study design and implementation for novice researchers;Baxter;The Qualitative Report,2008