1. Accident Facts. (1991). Chicago: National Safety Council.
2. Butler, Richard J., and Harold Gardner. (1994). ?Worker Productivity Failure and Disability.? Unpublished manuscript, Industrial Relations Center, University of Minnesota.
3. Butler, Richard J., Robert Hartwig, and Harold Gardner. (1993). ?HMOs, Moral Hazard, and Cost Shifting in Workers Compensation.? Unpublished manuscript, Industrial Relations Center, University of Minnesota.
4. Butler, Richard J., and John D., Worrall. (1988). ?Labor Market Theory and the Distribution of Workers' Compensation Losses.? In David, Appel and Philip, Borba (eds.), Workers' Compensation Insurance Pricing: Current Programs and Proposed Reforms. Boston: Kluwer Academic Publishers.
5. Butler, Richard J. (1983). ?Wage and Injury Rate Response to Shifting Levels of Workers Compensation.? In John D., Worrall (ed.), Safety and the Work Force: Incentives and Disincentives in Workers' Compensation. Ithaca, NY: ILR Press.