Secondary sources comment on, collect, review, analyze, explain or interpret primary sources. Remember that not all secondary sources are scholarly.
Examples
| Discipline | Primary Source | Secondary Source |
| History | Letters written by a historical figure | A journal article explaining why the letters are important |
| Literature | A poem | A biography of the author that quotes from the poem as an example of his/her work |
| Medicine | An empirical study about the effects of physical activity on childhood obesity | A systematic review article about childhood obesity that mentions the study |
| Kinesiology | An empirical study comparing the lunch function of endurance athletes and bodybuilders | A blog post about what the results of this study means for practicing bodybuilders |
| Sociology | An interview study where teenagers talked about their use of mobile technology | A news report about the study's findings |
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