1. Abortion -- Information from Healthwise
A therapeutic or induced abortion is one resulting from measures taken to intentionally end a pregnancy, using medications (medical abortion) or surgery. Surgical abortion is most commonly used to end a pregnancy, but medical abortion is becoming...
http://www.everettclinic.com/kbase/topic/special/tw1040/sec1.htm

2. Abortion -- National Library of Medicine
Induced Abortion (American College of Obstetricians and Gynecologists). Medical Abortion Procedures (American Pregnancy Association). Surgical Abortion Procedures (American Pregnancy Association). Abortion Surveillance - United States, 2002...
http://www.nlm.nih.gov/medlineplus/abortion.html

3. Abortion -- Information from the Merck Manual
The risk of complications from an abortion is related to the length of the pregnancy and the abortion method used. Induced abortion is the intentional ending of a pregnancy by medical means. Worldwide, the status of abortion varies from being...
http://www.merck.com/mmhe/sec22/ch255/ch255c.html#sec22-ch255-ch255c-883