1. Comparative Data: State and Provincial Licensing Systems;American Association of Motor Vehicle Administrators,1999
2. Problem solving and learning;Anderson;American Psychologist,1993
3. Practice and retention: a unifying analysis;Anderson;Journal of Experimental Psychology: Learning, Memory, and Cognition,1999
4. Nationwide Review of Graduated Driver Licensing;Baker,2007
5. Historical Annual Time Series of State Population Estimates and Demographic Components of Change: 1980 to 1990, by Single Year of Age and Sex;Bureau of the Census, United States Department of Commerce,2010