1. Afuah, A., & Tucci, C. (2003). Internet business models and strategies. Boston: McGraw-Hill.
2. Allee, V. (2000). The value evolution. Journal of Intellectual Capital, 1, 17–32.
3. Alt, R., & Zimmermann, H.-D. (2001). Preface: introduction to special section - business models. Electronic Markets, 11(1), 3–9.
4. Anderson, J. C., & Gerbing, D. W. (1988). Structural equation modeling in practice: a review and recommended two-step approach. Psychological Bulletin, 103(3), 411–423.
5. Axelsson, B., & Easton, G. (1992). Industrial networks, a new view of reality. London: Routledge.