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

Inclusive numbers
Numbers
Part III. Style 20 spelling

To express a range of numbers, such as pages or years, give the first and last (or inclusive) numbers of the sequence. If the numbers are spelled out, express the range with the words from and to; if they are expressed in numerals, use either these words or a connecting hyphen with no space on either side. In some settings, such as citations, always use hyphens (see chapters 16—19). Do not combine words and hyphens in expressing inclusive numbers.

from 45 to 50

but not

from 45—50

45—50

but not

forty-five—fifty

For inclusive numbers of one hundred or greater, you may either use full numbers on either side of a hyphen (245—280, or 1929—1994) or abbreviate the second number. Table 23.2 shows one system of abbreviation.

This system works well for both page numbers and years, which include commas only after they reach five digits, which rarely happens (see 23.2.2). For numbers that include one or more commas, repeat numerals to the right of the commas as necessary for clarity. Never abbreviate roman numerals (see table 23.1).

6,000—6,018

12,473—479

xxv—xxviii

For years, give all digits for a span that includes more than one century. Also give full dates in a system in which dates are counted backward from a specific point (most notably BC, “before Christ,” and BCE, “before the common era”). Otherwise, use the system shown in table 23.2. See 23.3 for more on date systems.

the years 1933—36

15,000—14,000 BCE

the winter of 1999—2000

115 BC—AD 10