Answered By: Ellen Quilty
Last Updated: Jul 07, 2020     Views: 5

ISSNs are not included in an APA 7th reference list or in a Chicago 17th bibliography.

APA 7th 

Where no DOI is given for an electronic resource, do not include a URL including database information in the reference.  Where an electronic article has been found on the internet (i.e. not through a library search), give the full URL to the web page where it was found.

Chicago 17th Notes & Bibliography

In the absence of a DOI, look for a persistent link, often available with the electronic resource. Sometimes a suitable URL will not be available and in such cases, include the name of the database rather than the URL.