There are different kinds of evidence, and each type is located in a different place. These are all compiled in the EBP section of the Social Work Library Guide.
Meta-analyses and systematic reviews usually focus on a specific clinical question and conduct an extensive literature search to identify studies with sound methodology. The studies are reviewed, assessed, and the results summarized according to the predetermined criteria of the review question. Use databases like Cochrane, Campbell, or Human Services Research Institute to find systematic reviews of evidence for treating a condition, or for intervening in a population. An example question for these databases is: "What is the best intervention(s) for reducing teen pregnancy in immigrant populations?"
In addition to the resources below, you can locate meta-analysis and systematic reviews in PsycINFO, in the advanced search in the Methodologies box.