PubMed comprises more than 23 million selected citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
Scopus is an abstract and citation database of peer-reviewed literature and quality web sources with tools to track, analyze and visualize research. Its content falls most heavily in the physical and life sciences, but it also covers social sciences and humanities literature.
Contains more than 47 million records, 70% with abstracts, more than 19,500 titles from 5,000 publishers worldwide. 70% of content is pulled from international sources. Includes MEDLINE.
Records since 1996 include searchable cited references.