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A secondary source is second-hand information written or created after an event. Secondary sources may summarize, interpret, review, or criticize existing events or works. Secondary sources were written or created after an event by people who were not at the original event. Secondary sources can be many formats including books, articles, encyclopedias, textbooks, or a scholar’s interpretation of past events or conditions.
Examples of Primary Sources and Secondary Sources:
Primary Source: Secondary Source:
An original painting by Mary Cassatt A book about the artist Mary Cassatt
President Lincoln's Gettysburg Address An article about Abraham Lincoln
A photograph of Harry Houdini A website about Houdini's magic tricks
An original Gershwin musical score A recent recording of Gershwin songs
(Source: U.S. Library of Congress https://ask.loc.gov/faq/303148)