| in paper |
 Thomas Ritz (2001) Personalized Information Services – an Electronic Information Commodity and ist Production
|
|---|---|
| authors |
 Shapiro. Carl u. Varian. Hal R.
|
| year | 1998 |
| title |
Information Rules. Boston
|
| source | Boston: Harvard Business School Press |
| last changed | 2008/06/07 10:15 |
