The secondary source depends on the primary source or original source of the information. Secondary sources interpret, evaluate or discuss information found in primary sources. In historiography, a secondary source is a study written by a scholar about a topic. Secondary sources frequently cite primary sources and other secondary sources. They rarely cite tertiary sources.
A secondary source would be a book on 13th century politics, while the Magna Carta itself would be a primary source. Many secondary sources use extensive citations in the form of footnotes or endnotes.
The main use of secondary sources in law is to explain the law. They also explain legal concepts. They are used to analyze and describe laws as well as comment on them. Judicial decisions and opinions by qualified experts are secondary sources.
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