secondary literature

Secondary literature refers to information that analyzes, interprets, or retells events or studies based on firsthand accounts or original records. Unlike primary sources, which are contemporary to the event or subject, secondary sources are created at a later time and offer a more removed perspective.1

The development of secondary literature, such as reviews, abstracts, and indexes, emerged in the 19th century as a response to the overwhelming quantity of primary information. These tools help to filter and organize vast amounts of primary literature, making it easier for researchers to identify and access relevant information within specific subject areas. This process is crucial for navigating the extensive body of recorded knowledge.23