1. Agency for Healthcare Research & Quality. (2003). AHRQ quality indicators. Retrieved February 20 2006 from http://www. qualityindicators.ahrq.gov
2. Agency for Healthcare Research & Quality. (2006). AHRQ quality indicators: Pediatric quality indicators overview. Retrieved March 21 2006 from http://www.qualityindicators.ahrq.gov/ pdi_overview.htm
3. educational levels of hospital nurses and surgical patient mortality;Aiken L.H.;Journal of the American Medical Association,2003
4. Lower Medicare mortality among a set of hospitals known for good nursing care;Aiken L.H.;Medical Care,1994
5. Modeling organizational determinants of hospital mortality;Haider A.;Health Services Research,1991