The standard manual for Turabian Style is
Turabian, Kate L. A Manual for Writers of Research Papers, Theses, and Dissertations, Ninth Edition (2018).
Note that there are actually two Turabian styles:
What is the difference between Chicago and Turabian?
Essentially the two styles are the same, but there are some differences in style manuals:
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.
Thus, if you see a citation in "Chicago Style" it is also in Turabian style.
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