A searchable collection of ebooks, most of which are encyclopedias and other reference materials. Great for background information on a topic.
The Education Resource Information Center's index to articles and documents from scholarly education literature, plus a database including over 1,000 full-text journals. Watch a video on how to use this database.
WorldCat
Google Scholar searches scholarly literature online. Rather than indexing web sites, the engine indexes articles, article and book citations, and theses.
Google Scholar has some advantages:
There are also disadvantages: