1. Baligh, H./ Richartz, L. (1967): Vertical Market Structures, Allyn and Bacon, Boston, Mass.
2. Becker, J./Schulte, R. (1996): Handelsinformationssysteme, Landsberg/Lech.
3. Benjamin, R./Wigand, R. (1995): Electronic Markets and Virtual Value Chains on the Information Highway, In: Sloan Management Review, 1995, Winter, S. 62-72.
4. Blume, M./Goldstein, M. (1995): On the integration of the US equity markets. Working Paper, University of Pennsylvenia.
5. Cerqueiro, A./Kosuge, Y. (1996): Electronic Payment Systems on the Internet, (http://www-sloan.mit.edu/15.967/group02/pay_main.htm).