1. Amazon.com. (2008, November 24). Investors relations: Press release. Retrieved December 10, 2008, from http://phx.corporate-ir.net/phoenix.zhtml?c=97664&p=irol-newsArticle &ID=1229410&highlight=
2. Amazon.com. (2010). Kindle device unit sales accelerate each month in second quarter: New $189 price results in tipping point for growth. Retrieved November 20, 2010, from http: www.phx.corporate-ir.net/phoenix.zhtml?c=176060&p=irol-newsArticle&ID=1449176&highlight=
3. Building trust in online auction markets through an economic incentive mechanism
4. Information Gatekeepers on the Internet and the Competitiveness of Homogeneous Product Markets
5. Configurators/Choiceboards