The Chicago or Turabian style, sometimes called documentary note or humanities style, places bibliographic citations at the bottom of a page or at the end of a paper. Although the 14th edition of The Chicago Manual of Style (1993) and the 5th edition of Turabian's Manual for Writers (1987) also offer guidelines for parenthetical documentation and reference lists, the Chicago and Turabian styles are most commonly thought of as note systems. Check with the instructor who assigned your paper to determine whether you need to use notes or whether you can cite sources parenthetically in your text.
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