Best Bets
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APA PsycArticles (Formerly PsycARTICLES)Fulltext, peer-reviewed scholarly and scientific articles in psychology. Contains 153,000 articles from 80 journals published by the APA and others.
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Psychology & Behavioral Science CollectionSearches a broader range of journals and magazines on psychology and mental health.
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PubMedComprehensive search interface for professional and peer reviewed (scholarly) biomedical literature maintained by the US National Library of Medicine.
Not sure what type of information you need? Check out these slides on the Universe of Psychology Publications.