Web of Science Core Collection [via Clarivate Analytics]
Web of Science Core Collection enables searching of top-cited peer-reviewed content across the sciences, social sciences, and humanities with “cited reference” search capabilities. “It is a curated collection of over 20,000 peer-reviewed, high-quality scholarly journals published worldwide (including Open Access journals) in over 250 science, social sciences, and humanities disciplines. Conference proceedings and book data are also available.” There is also access to Journal Citation Reports which provide impact metrics like the Journal Impact Factor (JIF) and Eigenfactor Scoring. Web of Science also has article, author and institutional citation indices.