1. American Hospital Association Annual Survey of Hospitals 2004 ttps://www.associationstores.org/OA_HTML/Survey%20Brochure.pdf
2. American Hospital Association Guide 2003 https://www.associationstores.org/OA_HTML/7-AHA%20Guide%20Brochure.pdf
3. Patient safety in hospital acute care units;Blegen;Annual Review of Nursing Research,2006
4. Nurse staffing and patient outcomes;Blegen;Nursing Research,1998
5. A multisite study of nurse staffing and patient occurrences;Blegen;Nursing Economics,1998