: Re: If a heading is in roman numerals, is an in-text cross reference also in roman, or arabic, or spelled out Where in the Chicago Manual of Style is the answer to my subject question? I looked

@Sherry594

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You should certainly follow the same style used in the heading if there are multiple levels, and different systems are used for numbers. It avoids confusion.

If it's a less structured document, like the chapter titles of a book, you have more flexibility. I'd suggest either spelling it out or using the style from the chapter heading.

Chapter XX

In Chapter XVIII, we examined the methods for the investigation.

Or...

Chapter XX

In Chapter Eighteen, we examined the methods for the investigation.

You might see a mix of number styles in cases where the layout person decided the chapter titles would look nice in Roman numerals, but I wouldn't recommend writing that way.

It's probably easiest to stick to Arabic numbers, and then just follow the usual rules for writing or spelling numbers.

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