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Different types of information - blogs, newspapers and news websites, magazines, journal articles, books and so forth, each contribute in different ways to your research.
When using these different types of information sources consider how, why, and for whom they are originally produced. Consideration of the information source and its original purpose should be factored into your understanding of its content.
The University of Illinois at Urbana-Champaign's undergraduate library created this graphic to illustrate the information cycle: