What is a Secondary Source?
Most simply, secondary sources are not direct pieces of evidence, but rather commentary on and discussion of evidence (that is, a primary source). The link below provides some useful examples of what constitutes a primary source vs. a secondary source in a wide variety of disciplines:
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http://lib1.bmcc.cuny.edu/help/sources.html
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http://lib1.bmcc.cuny.edu/help/sources.html