Secondary sources are based upon the examination of primary and/or other secondary sources. A secondary source describes, interprets, evaluates, and/or analyzes primary sources. A secondary source is at least one step removed from an event or time period. However, secondary sources may include pictures, quotations, graphs, or data from primary sources with the text. Types of secondary sources include:
- biographies
- dissertations
- textbooks
- books
- articles (magazine, journal)
- reviews
- histories
- criticisms
- commentaries
