Many periodicals are known for being partisan (biased) in their reporting - either liberal (left-leaning) or conservative (right-leaning) in their point of view. Other periodicals stay centrist or moderate in their viewpoints.
When using it as a source in your paper, it is essential to be aware of a periodical's bias. Try to determine a periodical's bias and use articles that show many different viewpoints (liberal, centrist/moderate, conservative) so that your paper is balanced. Make sure to acknowledge the source's bias in your paper (mentioning the paper's partisan slant, the reporter's personal viewpoints, etc.).
This guide will help you locate periodicals with a particular viewpoint (bias). Each section - liberal, centrist/moderate, and conservative contains journals, magazines, and newspapers that are partisan.