1. Amazon http://askville.amazon.com/customers-amazon-usa-total/answerviewer.do?requestid=67750214
2. eBay UK http://pages.ebay.co.uk/aboutebay/thecompany/companyover/view.html
3. Modelling trust using transactional, numerical units;Kerr;Acm International Conference on Privacy, Security and Trust,2006
4. Goodwill hunting: an economically efficient online feedback mechanism for environments with variable product quality;Dellarocas;Workshop on agent-mediated electronic commerce,2002
5. Trust and reputation on ebay: Towards a legal framework for feedback intermediaries;Rietjens;Information and Communications Technology Law,2006