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University Library, University of Illinois at Urbana-Champaign

Online Reference Collection

Use reference resources like encyclopedias and dictionaries for quick access to reliable facts.

What is a Reference Source

Reference sources are research tools that can be consulted for quick answers, facts, or overviews. They can be used to gather initial information as well as provide sources for additional research. There are a wide range of reference sources available. Use the table below for help selecting the right resource, search through Resources by Subject, or use our Ask A Librarian service for additional help.

General Reference Sources

Reference Collections

Use reference collections to search multiple reference sources at once.