They are interpretations or criticism of primary sources such as:
2. Review articles,
3. General articles on specific topics,
6. Magazine articles, and
Mrs. Jones (a journalist) interviewed people involved in the recently
much debated topic of whether city A should build an airport in section
X (a potential wetland area). She wrote an article analyzing both viewpoints.
Although she made a point that both sides should be heard, she was more
sympathetic to the opposition party. Her article reflects such a tendency
in the concluding paragraph. Her article is, therefore, an example of
a secondary source.