Please check the assignment formatting requirements for your individual unit as they may differ from the advice provided in the Chicago manual.
A Digital Object Identifier (DOI), is a string of numbers, letters and symbols that creates a permanent link to a journal article, book or other online document, e.g. 10.1108/HER-10-2015-0023.
In the Chicago Author-Date style, DOIs are presented as plain text links and preceded by https://doi.org/... followed by a full stop. For example: https://doi.org/10.1108/HER-10-2015-0023.
Where can I find the DOI?
DOIs will usually be presented on the first page of an article or with the publication details. If you cannot locate a DOI, do a quick search in the document by clicking CTRL + F (Windows) or Command + F (Mac) and entering doi in the search box