Credo was formerly called Xreferplus...

"Xreferplus is a giant online reference library that provides you with access to a selection of 100 reference books. Xreferplus includes encyclopedias, dictionaries, thesauri and books of quotations, not to mention a range of subject-specific titles covering everything from art to accountancy and literature to law."

"Xreferplus is packed with features and content to help you with assignments and research projects.

You have access to the full text of the best reference books, along with images, customizable data, visual concept maps of results, sound, maps, and more.

What else do you get?

Broad and rich content - hundreds of reference books cover every major topic, including art, medicine, history, technology, and more. The collection features: over 2 million entries; 180,000 audio pronunciation files; 66,000 art, science, and medical images; and 90,000 atlas images of places and geographic features throughout the world.

Over 60,000 images - Need art images? Or science, technology or medical photos? Just do a search and hit the "prefer results with images" radio button.

Audio pronunciation files help with medical or scientific terms, or dictionary definitions. Do a search and hit the "prefer results with audio" radio button.

Interactive maps - over 90,000 places and geographic features are covered. Need to identify islands in Indonesia? Volcanoes in Hawaii? We've got you covered.

Customizable, exportable data tables. Design your own research; compare country data from the CIA World Factbook or data from the US Census. You can add columns from your choice of hundreds of data fields and customize, chart, and export your data. Try creating tables with the CIA World Factbook.

Visual maps of results - the Concept Map delivers an interactive display of search results and the relationships among them, clustered by topics and subtopics. You can navigate the Concept Map to find topic ideas for papers, discover previously hidden connections, or uncover areas that warrant further exploration. Try it!

Multiple search preferences allow you to rank results by relevancy or entry length, as well as availability of images or sound files.

Citation formatter - allows easy, automated formatting of citations in your choice of APA, MLA or Chicago style. Your search results include a citation that can be reformatted with one click. Here's an example.

Cross-references - you can jump seamlessly from images to biographical information, from science and technology to medical encyclopedias and tables of statistical data (that you can download and customize). And don't limit yourself by topic. Discover the real power of cross-searchable online reference by searching the entire collection for accurate answers in context."