Chicago Headings

The Chicago format has 5 different optional heading styles

• Centered, Boldface or Italic Type, Headline-style Capitalization 

• Centered, Regular Type, Headline-style Capitalization

• Flush Left, Boldface or Italic Type, Headline-style Capitalization  

• Flush left, roman type, sentence-style capitalization

• Run in at beginning of paragraph (no blank line after), boldface or italic type, sentence-style capitalization, terminal period.

From https://owl.english.purdue.edu/