1. Crossing the quality chasm: a new health system for the 21st century,2001
2. American College of Surgeons. ACS national surgical quality improvement program. Available at: https://acsnsqip.org/main/default.asp. Accessed January 10, 2013.
3. Shneiderman B. Tree visualization with tree-maps: 2-d space-filling approach. ACM TOG 1991; 11:92–.
4. Using treemaps to visualize the analytic hierarchy process. Technical report CAR-TR-719;Asahi,1994
5. Smartmoney map of the market. Available at: http://www.smartmoney.com/marketmap. Accessed November 12, 2012.