Purdue Owl Chicago guide: https://owl.english.purdue.edu/owl/resource/717/01/
Purdue Owl Chicago Author-Date Sample Paper (PDF): https://owl.english.purdue.edu/owl/resource/717/10/
Chicago Manual of Style Online Citation Quick Guide: http://www.chicagomanualofstyle.org/tools_citationguide/citation-guide-2.html