Generally, literature is
Pictured above is a triangle with the bottom layer the biggest and top layer the smallest organized into two groupings. Layers listed top to bottom:
Source: Turner, M. (n.d.). UC Library Guides: Evidence-Based Practice in Health: Hierarchy of Evidence. Retrieved April 7, 2021, from https://canberra.libguides.com/c.php?g=599346&p=4149721
Scientists and researchers read the literature to
Part of this page's content was adapted from Ken Rice and Lianne Sheppard.