In the sciences, a primary source describes original research, while a secondary source analyzes or comments on a primary source or sources. For example, a research article is primary literature because it describes an original experiment and its results, while a review article is secondary literature because it collates multiple research articles to describe the current state of the field.
Go-to source of articles in biomedicine, biochemistry, and related medical fields. Search Medline, life science journals, and online books through the National Center for Biotechnology Information (NCBI). Many search results link to full-text articles in journals through library subscriptions.
Full-text consumer health magazines, reference books, and pamphlets. Also contains Clinical Reference Systems reports (in English and Spanish); Lexi-PAL Drug Guide; and Merriam-Webster's Medical Desk Dictionary. Coverage 1984-present; coverage differs from magazine to magazine.