Hal R. Varian, Microeconomics: A Modern Approach, Chapter 33. Welfare, 2002
Famous Hal Varian Quotes
Hal R. Varian, Part I. "Competition and market power", in The Economics of Information Technology: An Introduction (2004) by Hal R.Varian, Joseph Farrell and Carl Shapiro
The structure of the Internet http://pewinternet.org/Reports/2010/Future-of-the-Internet-IV/Part-4Architecture.aspx?r=1, a report from the Pew Internet & American Life Project, 2010.
"Part 1: A review of responses to a tension pair about whether Google will make people stupid."