Numbers - Parenthetical citations–reference list style: the basic form - Part II. Source Citation

A manual for writers of research papers, theses, and dissertations, 7th edition - Kate L. Turabian 2007

Numbers
Parenthetical citations–reference list style: the basic form
Part II. Source Citation

In titles, numbers are spelled out or given in numerals exactly as they are in the original. Page numbers that are in roman numerals in the original are presented in lowercase roman numerals. All other numbers (such as chapter numbers or figure numbers) are given in arabic numerals, even if they are in roman numerals or spelled out in the original.