1. C. M. Clancy: Emergency Departments in Crisis: Opportunities for Research. Health Serv. Res, vol. 42, no 1, p. 13–20, 2007.
2. M. Crosse: Hospital Emergency Departments: Crowding Continues to Occur, and Some Patients Wait Longer Than Recommended Time Frames. DIANE Publishing, 2010.
3. D. J. Griffin: Hospitals: What They Are and How They Work. Jones & Bartlett Publishers, 2011.
4. N. R. Hoot and D. Aronsky: Systematic review of emergency department crowding: causes. effects, and solutions , Ann. Emerg. Med, vol. 52, no 2, p. 126–136, 2008.
5. IOM: Hospital–Based Emergency Care: At the Breaking Point. Washington, DC. Washington, DC: The National Academies Press, 2007.