Tertiary Source

The least desireable of sources for documentation or research, Tertiary sources can still be valuable. In general the farther removed from the Primary Source you are, the more sources you should use.

Examples of Tertiary Sources:

• A translation of a period text about how to do something is a Tertiary source for that action, a secondary source for writing of the time.
• The conclusions in a book by a learned researcher comparing several secondary sources.