1. The World Health Organization;Health Systems: Improving Performance,2000
2. Mirror, Mirror on the Wall: An International Update on the Comparative Performance of American Health Care;Karen Davis;Commonwealth Fund,2007
3. Measuring the Health of Nations: Analysis of Mortality Amenable to Health Care;Ellen Nolte;British Medical Journal,2003
4. The Waiting Game;Paul Krugman;New York Times,2007