The Evidence Pyramid provides a guide to levels of quality and the amount of research available at that level.
Bibliographic databases provide access to primary literature of all levels of the pyramid.
Point of Care Resources are secondary sources that bring together high-quality evidence to provide guidelines or recommendations for practice.
Walden University. (2020). Levels of evidence pyramid. https://academicguides.waldenu.edu/library/healthevidence/evidencepyramid
The Medical Research Library of Brooklyn: SUNY Medical Center. (2014). The Evidence Pyramid. https://guides.downstate.edu/c.php?g=856794&p=6152125