Secondary sources of information are based on primary
sources. They are generally written at a later date and provide some
discussion, analysis, or interpretation of the original primary source.
Examples of secondary sources include:
review articles or analyses of research studies about the same topic
(also often in peer-reviewed publications)
biographies, reviews, or critiques of an author
analyses of original documents or archival material
TIP: What is considered primary, secondary, or tertiary
information may vary according to your field of study. When in doubt,
ask your professor.