Evidence-based practice sources, like literature reviews and meta-analyses, summarize and evaluate evidence from empirical research studies. They discuss trends, outstanding questions, and emerging consensus among studies on a particular topic.
In Evidence-Based Practice (EBP), research studies are ranked in a Hierarchy of Evidence. Information sources described near the top of the pyramid are the most thoroughly reviewed and synthesized. The type of sources you need to seek will depend on the type of question you need to answer.
Research design and evidence, CC BY-SA 4.0, via Wikimedia Commons