Whenever you use books, journals, or Web sites in your research you must credit to the original authors by properly citing the sources. Citations also help your reader find the sources again. There are a number of different citation styles, depending on the discipline in which you are working. For this class you'll be following Chicago Style Citations, specifically the notes-bibliography format.  
You will need to create endnotes and a bibliography for your ibook project. (ibooks from previous semesters)