The Chicago and Turabian styles are almost the same. Turabian is a simplified version of Chicago, and includes advice about writing. Chicago style is intended for works for publication. Turabian style is more pared down and intended for papers, dissertations and theses that are not intended for commercial publication.
There are just a few very slight differences between the styles, for example, Chicago leaves it up to the writer to decide whether to include the date accessed for a website; Turabian requires it.
Both styles have two citation systems: Author/Date and Notes/Bibliography. Author/date is more common in the sciences and social sciences and uses in-text, parenthetical citation of sources with a reference list at the end, Notes/Bibliogaphy is common in the humanities, uses footnotes, and includes a reference list (bibliography) at the end of the work.
The Chicago Manual of Style includes a Turabian citation guide that includes Notes and Bibliography style or Author-Date style.
The Chicago Manual of Style/Turabian's Manual for Writers offers helpful tip sheets about common questions. These show a sample page with detailed instructions for placement and explanatory notes.
Elements in your text should appear in the following order. More detailed instructions with explanations are on page 387-411 of Turabian's A Manual for Writers.
Front Matter
Text
Back Matter
“Many journal articles are available online, often through your school’s library website or from a commercial database. To cite an article that you read online, include a URL. If a URL is listed along with the article, use that instead of the one in your browser’s address bar. If a DOI is listed, append the DOI to https://dx.doi.org/ to form the URL If you consulted the article in a commercial database, you may give the name of the database instead of a URL. See 15.4.1 for more information." (p 187, Turabian 9th Edition)