Let's go to the library!
For historical scholarship specifically, check out America: History and Life (for scholarship in American history) and Historical Abstracts (for world history). To get to these, go to the library homepage, then click Databases (below the homepage search bar, on the left), then find "History (US)" of "History (World)" under "Subjects." Links to these databases appear on those page.
To search current newspapers, start here. To search historical newspapers, start here.
For guidance on citing scholarly books, articles, etc., in MLA style are here.