1. Using Panel Data to Estimate the Effects of Events
2. American Hospital Association. (1984, 1985, 1987, 1988, 1989, 1990, 1992, 1993). Annual survey. Chicago: American Hospital Association.
3. ARDA. The Association of Religion Archives. (n.d.). Churches and church membership in the United States. Accessed March 17, 2006, http://www.thearda.com/Archive/Files/Descriptions/CMS90ST.asp.
4. ATRA. The American Tort Reform Association. (1995). State and federal reforms. Accessed June 25, 2006, http://www.atra.org/reforms/.