Index and cited references for articles in the arts and humanities, sciences, and social sciences.
Access the world’s leading scholarly literature in the sciences, social sciences, arts, and humanities and examine proceedings of international conferences, symposia, seminars, colloquia, workshops, and conventions.
Scopus is a large abstract and citation database of research literature and quality web sources. It's designed to find the information scientists need.
PubMed, a service of the U.S. National Library of Medicine, includes over 18 million citations from MEDLINE and other life science journals for biomedical articles back to the 1950s.
PubMed provides access to bibliographic information that includes MEDLINE, as well as: The out-of-scope citations (e.g., articles on plate tectonics or astrophysics) from certain MEDLINE journals, primarily general science and chemistry journals, for which the life sciences articles are indexed for MEDLINE. Citations that precede the date that a journal was selected for MEDLINE indexing. Some additional life science journals that submit full text to PubMedCentral and receive a qualitative review by NLM.