Citation, Documentation of Sources

Q. Hello. I am writing an essay for history in Chicago style, and when I state a fact I have been putting the number of the citation in parentheses after I have stated it. Is this correct? Example: Abe Lincoln became president in 1861. (5) Or do I need to put it as an exponent following the text?

A. Some citation systems do use parentheses like that to refer to a numbered list of sources, but Chicago style is to use a superscript number that refers to an endnote or footnote containing a citation. Here’s the Turabian Tip Sheet that shows how it looks with footnotes. Please see the “For Students” page at CMOS Shop Talk for answers to many questions on writing a paper and citing sources (scroll to “Chicago Style Basics”).