Tertiary Information Sources

Even further removed from the original source is a tertiary source. An example is a bibliography (citation list) of primary and secondary sources about a person or topic.

For example:

A bibliographic guide to North American industry : history, health, and hazardous waste by Dale A Stirling. Publisher: Lanham, Md.: Scarecrow Press, 2009. 
Encyclopedias are often viewed as tertiary sources because they review a topic and usually include bibliographies of primary and secondary sources consulted.
 
Databases and indexes are tertiary sources which provide access to materials on specific topics.

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