The Research Toolkit
"What types of sources should I use for my research? How and in what types of materials should I search to retrieve relevant and useful information? Why should I bother to cite my sources?"
For help with questions like these and more, the library has created a toolkit of the basic skills you will need in order to successfully complete your research projects:
Research Toolkit from the Hunter College Libraries
Evidence-Based Medical Literature
This graphic ranks different types of publications and research activities according to their basis in evidence, with systematic reviews considered the strongest form of evidence-based literature.
Source: SUNY Downstate/Medical Research Library of Brooklyn, http://library.downstate.edu/EBM2/2100.htm