7Dorothy leonard. Wellsprings of Knowledge. Boston: Harvard Business School. 1995.
8Gautam Bose and Mark Pingle. Stores. Economic Theory.1995 (6) :251 - 62.
9Geoge Akedof. The Market for "Lemons": Quality Uncertainty and the Market Mechanism. Quarterly Journal of Economics .1970(5) :488 - 500.
10Claire Vishik. Intermediation and Quality Uncertainty in the Internet Environment. Journal of Education for Library and Information Science. 1999(4) : 263 - 81.
