1. The Guttmacher Institute. Get “In the know”: 20 questions about pregnancy, contraception and abortion. Last accessed: Feb. 12, 2007. Available at: http://www.guttmacher.org/in-the-know/index.html.
2. Institute AG. Facts in brief: induced abortion in the United States. Last accessed: Feb. 12, 2007. Available at: http://www.guttmacher.org/pubs/fb_induced_abortion.html.
3. Repeat abortion and use of primary care health services;Westfall;Fam Plann Perspect,1995
4. Repeat abortion: is it a problem?;Berger;Fam Plann Perspect,1984
5. Correlates of repeat induced abortions;Bracken;Obstet Gynecol,1972