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Is there a specific style guide and/or dictionary that you (or the original editor) are following? If yes, then go by those rules. If you are dealing with an older book/document and want to keep the original styling (as you say in your original post), then try to find the oldest copy of the work that you can. Check with your local library system or some local colleges/universities to see what they have available. But otherwise, as was already mentioned, sometimes editors of newer editions will choose to update some of the style decisions to be in line with more modern usage.
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