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This content analysis of three newspapers looks at the extent to which two context elements, routine and conflict, affect the mix of sources. The hypothesized effect (that nonroutine and conflict-based news would contain a greater diversity of sources) was found only for proximate news stories. Although journalists can develop a diverse pool of sources in their own communities, only the most visible sources are easily reachable in other locations.
Berkowitz et al. (Mon,) studied this question.