Web of Science is a website that provides subscription-based access to multiple databases that provide comprehensive citation data for many different academic disciplines.
openICPSR is a research data-sharing service for social and behavioral sciences.
Elsevier is a global information analytics business that helps institutions and professionals progress science, advance healthcare and improve performance.
EconBiz is an academic search portal for journals, working papers, and conferences in business studies and economics.
ERIC – Education Resources Information Center is an online library of education research and information, sponsored by the Institute of Education Sciences (IES) of the U.S. Department of Education.
Microsoft Academic is a free public web search engine for academic publications and literature, developed by Microsoft Research.