1. http://www.etforecasts.com/pr/pr201.htm
2. http://www.emarketer.com/ereports/ecommerce_b2c/
3. http://ecommerce.internet.com/opinions/article/0,1467,3551_751371,00.html
4. http://news.ft.com/ft/gx.cgi/ftc?pagename=View&c=Article&cid=FT3JIJ9RCLC&live=true&tagid=ZZZC00L1B0C& Collid=ZZZ96PECC0C
5. http://www.webmergers.com/editorial/article.php?id=10 C. Allen, D. Kania, B. Yaeckel, Internet World Guide to One-To-One Web Marketing (Internet World Series) 1998, Mecklermedia.