1. Administration for Children and Families 1998 AFDC baseline report, 1998 https://aspe.hhs.gov/pdf-report/aid-families-dependent-children-baseline
2. Administration for Children and Families 2014 TANF caseloads http://www.acf.hhs.gov/ofa/resource/caseload-data-2014
3. Assistant Secretary for Planning and Evaluation 2001 State welfare waivers: An overview http://aspe.hhs.gov/hsp/isp/waiver2/waivers.htm
4. Incentive contracts and performance measurement;Baker;Journal of Political Economy,1992
5. Why measure performance? Different purposes require different measures;Behn;Public Administration Review,2003