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Chicago (University of Chicago Press) style is most commonly used to inform style and citations in the humanities and social sciences, including history. Turabian is a relative of Chicago Style.
What is the difference between Chicago and Turabian?
The primary difference is that Turabian is shorter and contains fewer instructions, and does not contain information about publication. The Chicago Manual of Style is designed for professionals in the field who are publishing, and has a great deal of instruction on formatting and many other things. Turabian is a pared-down version designed for students writing research papers.