- Evidence Based Medicine, Sackett et al; Churchill Livingstone New York, 1997
- How to read a paper, Greenhalgh T, BMJ Series: 315: 7101, 7102, 7103, 7104,
7105, 7106, 7107, 7108, 7109, 7110; 1997.
Accessed through the BMJ Web Site: http://www.bmj.com/archive