Primary, Secondary, and Tertiary Sources: Secondary Sources

Secondary sources are:

• Removed from the original source and repackaged
• Commentary on and discussion of evidence
• Works that interpret or evaluate the primary data, such as:
  • Monographs
  • Notes on a professor's lecture
  • A newspaper article reporting on a scientific study published elsewhere
  • Biographical works
  • Textbooks
  • Works of criticism and interpretation