1. Bureau of the Census, 2005. Population estimates, see: eire.census.gov/popest/archieves/1990.php#state.
2. Bureau of Labor Statistics, 2005. Historical state labor force data, see: www.bls.gov/lau/home.htm.
3. Cameron, A.C., Trivedi, P.K., 1998. Regression Analysis of Count Data. Cambridge, UK, Section 3.5.1.
4. Centers for Disease Control and Prevention, 1999. Ten great public health achievements. MMWR Morb. Mortal. Wkly Rep. 48 (12), 241–243.
5. Does setting limits save lives? The case of 0.08 BAC laws;Dee;J. Policy Anal. Manage.,2001