The definition of a primary source depends upon the discipline and on how one is using the source.
Usually, a primary source is a direct, first-hand account of an event. It is usually something that was created at the time of an event, or shortly thereafter. Examples include:
A secondary source would be something that interprets, analyzes, or remarks upon a primary source. Examples include:
A tertiary source is further removed from a primary source. It leads the researcher to a secondary source, rather than to the primary source.
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