Q. When writing an academic paper that is based on the analysis of one book, do you need to footnote each sentence that paraphrases an idea from the book or does the fact that it is known and stated that the entire paper is an analysis of the book’s themes sufficient?
A. You should be very careful to cite the page references to every idea you use from another source. You don’t have to create a whole new footnote for each one. In the first footnote, where you give a complete citation, you can add “Hereafter cited in the text.” Then you can cite further page references in parentheses in the text (Jones, Methods, 312). See CMOS 13.67 for more ideas on how to treat frequent references to a single source.