Information is available in a wide variety of formats, such as newspapers, audiovisual media, blogs, newpapers, books, articles from periodicals (such as trade journals, academic journals, and magazines), conference proceedings, research reports, and so on.
The kind of information you need to find for your paper depends entirely on the research question you're trying to answer. Of course writing a university-level paper means using mainly scholarly articles and books, but perhaps you need financial or other data as well.
Consider the following:
Most important publication types:
To be found:
To see the typical components of a scholarly journal article check out the resource Anatomy of a Scholarly Article
by North Carolina State University. Click on the highlighted areas of the article to learn more about the component in question.