1. Smith G Pond A A Slight but Steady Majority Favors Keeping Abortion Legal Pew Forum on Religion & Public Life 2008
2. Pew Research Center for the People & the Press and Pew Forum on Religion & Public Life Issue Ranks Lower on the Agenda, Support for Abortion Slips: Results from the 2009 Annual Religion and Public Life Survey Pew Research Center for the People & the Press and Pew Forum on Religion & Public Life 2009
3. An overview of abortion laws;Guttmacher Institute;State Policies in Brief (as of March 2012),2012
4. Requirements for ultrasound;Guttmacher Institute;State Policies in Brief (as of March 2012),2012