What do I do if I'm referencing in Harvard and there is no volume or issue number for a journal article?
“In press”, “pre-proof”, “advanced online publication” usually refer to articles that have been accepted for publication but not yet assigned to a publication volume/issue. These articles can be cited using the year of online publication and the DOI.
For example:
Author Surname, Initial(s) Year, 'Article title', Journal Title, doi: 10.xxxx/xxxxxxxxxxxx..
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