The American Psychological Association's index to journals, books, dissertations, and reports on psychology and related fields. Includes indexing from Psychological Abstracts. Covers 1840 to the present.
Clarivate Analytics' premier citation databases in the sciences (physical, life and social) and arts & humanities. Search for articles that cite a known author or work or by standard search queries. Covers 1864 to the present.
Provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources. Google Scholar helps you find relevant work across the world of scholarly research.