Information sources
Classification
Origin
A primary information source is a place where original information resides (usually true).
A secondary information source is a document or record that relates or discusses information originally presented in primary information sources (needs to be verified).
Tertiary information sources are made up of lists or summaries of primary or secondary sources, such as bibliographies, lists of readings, or articles on research.
Authority
Closed Source Information.
Open Source Information.
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