"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
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