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These are great places to get pro/con and overview information about broad topics in health and medicine:
A guide for classification of mental disorders with associated criteria designed to facilitate more reliable diagnoses of these disorders. SUNY Empire Login Required
Why Use Reference Sources (encyclopedias, handbooks, or Wikipedia)?
Can I Cite an Encyclopedia (or Wikipedia) in my Paper?
Ask your instructor, but normally, encyclopedias provide insufficient information when researching a topic. Instead, use them as a starting point to understand the scope and terminology associated with your topic, so that you can begin in-depth research.