This CMS example paper uses the Notes & Bibliography citation style. The sample paper was downloaded from the Purdue Online Writing Lab (Purdue OWL). The Purdue OWL is recommended for further guidance regarding formatting in the CMS N&B style.
"CMOS NB Sample Paper." The Purdue OWL. https://owl.purdue.edu/owl/research_and_citation/chicago_manual_18th_edition/cmos_formatting _and_style_guide/cmos_nb_sample_paper.html