PubMed comprises more than 25 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text. . Updated daily. Coverage is from the 1940's to present.
Embase - another crucial resource for discovering biomedical evidence within published, peer-reviewed literature, in-press publications and conference abstracts. Full-text indexing of drug, disease and medical device data - supported by Emtree - helps retrieve precise answers to search queries. Coverage is 1974 to present.
Reviews of clinical comparative effectiveness research (CER), with easy-to-read summaries for consumers as well as full technical reports. CER finds answers to the question “What works?” in medical and health care.
Scopus is a large abstract and citation database of research literature and web sources. Updated daily. Find citations by topic or author.
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From 1960 to present. Cited references go back much further.