Specific Rules #1 for Location (Pagination) (required) for Contributions to Books Vancouver Style: Roman numerals for page numbers

Keep roman numerals when they are used as page numbers.

Give roman numerals in upper or lower case, whichever appears in the publication.

Examples:

p. ix-xxi.

p. XIV-XVIII.

Según:

Citing Medicine: The NLM Style Guide for Authors, Editors, and Publishers [Internet]. 2nd edition. Chapter 2: Books

Related:

General Rules for Location (Pagination) (required) for Contributions to Books Vancouver Style

Specific Rules #1 for Location (Pagination) (required) for Contributions to Books Vancouver Style: Roman numerals for page numbers

Specific Rules #2 for Location (Pagination) (required) for Contributions to Books Vancouver Style: No page numbers appear on the pages of the contribution

Specific Rules #3 for Location (Pagination) (required) for Contributions to Books Vancouver Style: Optional chapter number

Examples for Location (Pagination) (required) for Contributions to Books Vancouver Style