1. Abortion in the United States: incidence and access to services, 2005;Jones;Perspectives on Sexual and Reproductive Health,2008
2. Abortion surveillance-United States, 2006;Pazol;Morbidity and Mortality Weekly Report,2009
3. Aftershocks: the impact of clinic violence on abortion services;Jacobson;American Economic Journal: Applied Economics,2011
4. The accessibility of abortion services in the United States, 2001;Finer;Perspectives on Sexual and Reproductive Health,2003
5. National Center for Health Statistics (NCHS) Vintage 2008 Bridged-Race Postcensal Population Estimates 2009 http://www.cdc.gov/nchs/nvss/bridged_race/data_documentation.htmvintage2008