Provides comprehensive, factual, and reliable summaries on a variety of subjects. 

General Encyclopedias

Provides comprehensive, factual, and reliable summaries on several components of a single subject.

Specialized Encyclopedias

- General encyclopedias
- Specialized encyclopedias 


Provide information on a variety of subjects or on several components of a single subject. 

Cassell, K. A., & Hiremath, U. (2018). Reference and information services: An introduction (Fourth ed.). ALA Neal-Schuman.