In-text citations in Chicago style generally include the author's last name and the page number(s) where the quoted or paraphrased material can be found in the originating source. For example:
According to Smith, "the data clearly shows that our sales are slipping" (33).
If the author's last name is not known, you can use the title of the work instead. For example:
According to the article "The Decline of the American Empire," "the data clearly shows that our sales are slipping" (33).
If you are quoting or paraphrasing material from a source that has no page numbers (such as a web site), you can give the author's last name and the relevant section heading. For example:
According to Smith in the section "The Decline of the American Empire," "the data clearly shows that our sales are slipping."