Oxford Reference OnlineThis link opens in a new windowMore than 2 million entries from hundreds of cross-searchable Oxford encyclopedias and other reference books, many of which are illustrated.
This link opens in a new window
This link opens in a new window
Gale eBooks Reference LibraryThis link opens in a new windowA collection of about 900 encyclopedias and other reference books from several publishers across many disciplines that can be searched at one time.