Google Scholar. Functions as both a key word database for articles and books. It automatically connects to select licensed content held by the UC libraries.
Oskicat. UC Berkeley libraries catalog. Includes records for most UCB library materials, including books, e-books, journal and e-journal titles, films and videos, maps, archival materials, and much more. See also the Quick Guide to Oskicat and Oskicat Tutorial.
Google Books. Search the text of books, view previews still in copyright, and read full text of out-of-copyright books. To find a copyrighted book, use the "find in a Library" link to locate the book at UC Berkeley.
Melvyl. Catalog for all UC Campus libraries, including selected libraries on campus not in Oskicat, e.g. the Boalt Law Library.
Citation or reference management tools help you manage your research, collect and cite sources, and create bibliographies in a variety of citation styles. Each one has its strengths and weaknesses.
Detailed information about all of these tools can be found on the library guide to managing citations.