The Britannica Library is a comprehensive encyclopedia covering all subjects. It has brief to in-depth articles, which get updated regularly. Research sources include thousands of curated articles and magazines, images, videos, audio clips, primary sources, maps, research tools, and recommended websites, along with a pop-up Merriam-Webster’s Dictionary and Thesaurus.
Credo Reference provides access to a broad variety of reference sources from dictionaries to encyclopedias covering topics from the arts to the sciences. It has an image collection, maps, customizable data, and audio pronunciation files. You can search the whole collection or a specific subject area.