1. CENTRAL Database. (n.d.). Retrieved June 16, 2003, from United States Cochrane Center Web site: http://www.cochrane.us/manage.htm
2. The Cochrane Library,2003
3. The Cochrane Library. (n.d.). Retrieved June 16, 2003, from Update Software Web site: http://www.update-software.com/Cochrane/
4. Development of the Cochrane Collaboration's CENTRAL Register of Controlled Clinical Trials;Dickersin;Evaluation and the Health Professions,2002
5. Resources for evidence-based practice, July/August 2003;Sakala;Journal of Obstetric, Gynecologic, and Neonatal Nursing,2003