Information credibility depends on a number of factors. You balance these factors to consider whether the source you are considering using is credible for the purpose that you wish to use it for.
Some databases, such as Environment and Energy News, Gannet Newsstand, and Proquest Newsstand, contain only news articles. Others contain multiple types of resources.
For databases with multiple types of resources (scholarly journal articles, magazine articles, newspaper articles) look for faceted searching on the left hand side of the screen. This tool often allows you to limit to specific source types such as newspapers or magazines.