Core resource for reliable citation information
Website from Princeton University Library
Note this uses the older edition of Chicago (15th), but it does give nice examples for digital primary sources
The Chicago Manual of Style, 17th Edition by University of Chicago Press Editorial Staff
Call Number: E-Book
Publication Date: 2017-09-05
Includes a helpful Quick Guide. Select Go to Notes and Bibliography Style if you are using footnotes or endnotes.
The Online Writing Lab of Purdue University has created a Short-hand guide to the Chicago Manual of Style (17th ed.), which is very useful, despite the advertisements now on the page.