1. Defending life 2008: Proven strategies for a pro-life America. A state-by-state legal guide to abortion, bioethics, and the end of life,2008
2. Constructing grounded theory;Charmaz,2006
3. The impact of laws requiring parental involvement for abortion: A literature review;Dennis,2009
4. Reasons U.S. women have abortions: quantitative and qualitative perspectives;Finer;Perspectives on Sexual and Reproductive Health,2005
5. Gallup Poll News Service. (2007). Gallup's pulse of democracy: Abortion. Available: http://www.galluppoll.com. Accessed April 1, 2007.