This style, from Chicago University Press, is common in the humanities and social sciences. The most recent version is CMOS 17th edition, published in 2017. It allows for two different systems of referencing. Confirm which system you are supposed to use:

• Chicago A notes and bibliography system uses footnotes or endnotes
• Chicago B author-date system uses in-text citations and a reference list (also known as Harvard style).

Tools and tips for Chicago A notes and bibliography

Tools and tips for Chicago B author-date