1. More Than a Third of U.S. Workers Are Freelancers Now, But Is That Good for Them;Susan Adams;Forbes,2014
2. History of the Mass Media in the United States
3. The State of Broadband 2014: Broadband for All;The State of Broadband 2015: Broadband as a Foundation for Sustainable Development,2014
4. The Nature of the Firm;R H Coase;Economica,1937