Evidence Based Medicine: What it is and What it isn't
Sackett, D., Rosenberg, W., Gray, J., Haynes, R., & Richardson, W. (1996). Evidence Based Medicine: What It Is And What It Isn't: It's About Integrating Individual Clinical Expertise And The Best External Evidence. BMJ: British Medical Journal, 312(7023), 71-72. Retrieved from http://www.jstor.org/stable/29730277
Tools for Implementing an Evidence-Based Approach in Public Health Practice
Jacobs JA, Jones E, Gabella BA, Spring B, Brownson RC. Tools for Implementing an Evidence-Based Approach in Public Health Practice. Prev Chronic Dis 2012;9:110324. DOI: http://dx.doi.org/10.5888/pcd9.110324
This is often referred to as the "Evidence Pyramid". It is used to illustrate the evolution of the literature.