Adauction website, September 1999.

AdOutlet website, September 1999.

Concept Media website, September 1999.

The Economist website.

Fountain Street Marketing Technologies website.

Grimes, Andrea, Account Executive, DDB Needham Worldwide, Inc., New York, NY, personal interview.

Hoover's Online The Business Network website.

Image Quest Communications website. September 1999.

Kosier, David. Understanding Electronic Commerce. Microsoft Press: Redmond, Washington, 1997.

Net Market Makers. "Digital Marketplaces: Enabling the Internet Economy." April 1999.

Riggins, Barbara, Sales Executive, WJLA-TV, Washington, DC, personal interview.

Sawhney, Mohabir. and Steven Kaplan. "Let's Get Vertical." Business2.0. September, 1999.

Target Europe website, September 1999.

U.S. Media Inc. website, September 1999.

Webtoads website, September 1999.

" Where Are You On The Web?" Fast Company October 1999: 300-312.

Yurman, Dan "Internet Commerce; Emerging Business Models." December 11, 1996. Electronically published on the Internet.