Why search here? You want to read summaries of previous research on a topic, giving you historical context and current understanding of the subject, as well as a list of sources to consult.
What's included? Over 30,000 literature reviews in the Biomedical, Life, Physical, and Social Sciences, dating back to 1932.
Understanding Research: Coping with the Quantitative - Qualitative Divide by 
Handbook of Methodological Approaches to Community-Based Research by 
