"Chicago/Turabian offer two styles of documentation, each one favored by different groups of scholars (1) the humanities or documentary-note style is favored by those in literature, history and the arts while (2) the author-date style is widely used by those in the natural or social science fields."
The Chicago Manual of Style, 17th Edition (2017) by 
A Manual for Writers of Research Papers, Theses, and Dissertations: Chicago Style for Students and Researchers, 9th Edition