For APA:
Please refer to the Missing information tab under the Journals, Newspapers & Magazines section of the guide.
Missing Information [9.26]: Usually journals have both a volume and an issue number, however, sometimes one of these might not be provided. Some online-only journals may have neither volume nor issue (this is rare). If you can't find both numbers, just use what you have.
For Chicago: [14.70]
The year should appear in parentheses after the volume and issue number, and may be preceded by an exact date, a month, or a season, e.g. ...17, no. 2 (April 2013).
When a journal uses an issue number and no volume number, a comma should follow the journal title.
