The National Library of Medicine free article search engine, containing article references from MEDLINE, PreMEDLINE, OLDMEDLINE, plus some publisher-supplied and out of scope citations from certain general science and chemistry journals.
Scopus is an abstract and citation database of research literature and quality web sources, including journals, conference proceedings, trade publications, abstracts, and patent records. It is a multidisciplinary resource covering materials from the humanities, sciences and social sciences. Also indexes EMBASE articles. Scopus allows you to locate the most highly cited items and the articles that cite them.
Date Coverage: 1970-present; selected access back to 1823
PsycINFO contains references to articles in more than 1,300 periodicals as well as technical reports, dissertations, and other materials in psychology and related behavioral and social sciences. With the inclusion of PsycARTICLES, over 44,000 full-text articles from more than 50 journals published by the American Psychological Association and participating publishers are provided.