Does Turnitin check against newspaper articles and books?

If the lecturer selected the option to check against newspaper articles and books when setting up the assignment, then the assignments will be checked against newspaper articles and books that are available online. 

This site provides extensive detail on originality reports and how they can be interpreted by staff and students: https://guides.turnitin.com/01_Manuals_and_Guides/Instructor_Guides/Turnitin_Classic_(Deprecated)/Interpreting_the_Similarity_Report