Here is a sample of some of the online encyclopedias available at the Healey Library.
The SAGE Handbook of Special Education
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Encyclopedia of Special Education: A Reference for the Education of the Handicapped and Other Exceptional Children and Adults
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An alternative to Wikipedia. Reference works such as encyclopedias are a good place to find background information on a topic, or to quickly look up a fact. They often include bibliographies telling you where to find additional information.
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.