Contains more than one million citations and summaries of journal articles, book chapters, books, dissertations and technical reports, all in the field of psychology. It also includes information about the psychological aspects of related disciplines such as medicine, psychiatry, nursing, sociology, education, pharmacology, physiology, linguistics, anthropology, business and law. Journal coverage, which spans from 1887 to present, includes international material selected from more than 1,700 periodicals in over 35 languages.

PubMed lists journal articles and more back to 1947. It covers the subjects of medicine, nursing, dentistry, veterinary medicine, health care systems, preclinical sciences, and related areas. Make sure to access PubMed with this link (instead of PubMed.gov) to get free full-text content.

A database of peer-reviewed research literature from more than 5,000 international publishers. Scopus covers the scientific, technical, medical and social sciences fields, as well as arts and humanities. Scopus includes scholarly journals, book series, conference proceedings, and industry-specific trade publications.

Web of Science contains content from over 12,000 journals worldwide, including over 150,000 conference proceedings. Covers the sciences, social sciences, arts, and humanities, back to 1900. Also has powerful citation analysis tools.

Google Scholar searches academic publishers, professional societies and pre-print archives.