I forgot italics in one of my referencesWatch this thread
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Tbh, I doubt you would get penalised for one instance of this. If everything else is consistent, it might not even be noticed.
I got full stops in my bibliography in random places as well
I once didn’t follow the essay format of double spacing and whatnot, and didn’t get penalised at all. I’ve seen some first class essays with wrong punctuation and they still get good marks. A minor problem in your citations wouldn’t cause a major issue unless you were supposed to do OSCOLA style of referencing and instead did the Harvard style.
Was it a quote or a footnote you had forgot to italicise? Personally my university didn’t like using italics unless it was for a book title, and I’d almost never italicise in the text itself.
I remember my dissertation tutor telling me once that consistency and accuracy are the main things when referencing. Everyone makes mistakes, especially if you’re doing a large piece of work with sometimes 40-50 or even 100+ (if your thesis) sources. I highly doubt you’d be penalised much if at all simply for not italicising a reference.