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

Enumerations
Numbers
Part III. Style 20 spelling

You may use numbers to enumerate points discussed in the text, in appendixes, or in materials related to drafting your paper.

LISTS. Your text may contain lists of items that you choose to enumerate for emphasis. When such lists are very short and simple, include them in one grammatical sentence. Be sure that all the items are grammatically parallel (all noun phrases, adjectives, and so forth). Each item should be preceded by an arabic numeral in parentheses. If there are more than two items, each should be followed by a comma (or, if the item is complex in structure, a semicolon; see 21.3). If the list is an appositive, use a colon to introduce it; otherwise, do not use punctuation in this position.

Wilson's secretary gave three reasons for his resignation: (1) advancing age, (2) gradually failing eyesight, and (3) opposition to the war.

The committee strongly endorsed the policies of (1) complete executive power, except as constitutionally limited; (2) strong legislative prerogatives; (3) limited judicial authority, especially when it interfered with their own role.

If you are already using arabic numerals in parentheses for other purposes, substitute lowercase italic letters for the numbers.

Haskin's latest theory has several drawbacks: (a) it is not based on current evidence and (b) it has a weak theoretical grounding.

If the items in the list are longer or you wish to give them greater emphasis, arrange them in a vertical list. Introduce the list with a complete sentence followed by a colon. Again, be sure that all the items are grammatically parallel, and begin each one with a bullet or an arabic numeral followed by a period, without parentheses. If the items are complete sentences, capitalize the first letter in each item, and use terminal periods; otherwise use lowercase letters and no periods (see 21.1). Align the numerals on the periods and the runovers with the first word in the first line.

My research therefore suggests the following conclusions:

1. The painting could not have been a genuine Picasso, regardless of the claims of earlier scholars.

2. It is impossible to identify the true artist without further technical analysis.

OUTLINES. In some situations, you may include an outline or a similar enumeration in an appendix to your paper, or in a draft stage of the paper (see 6.2.1). Use the following system of notation, consisting of letters and roman and arabic numerals, and indent each level by one further tab (usually a half inch). You should have at least two items to list at each level; if you do not, reconsider the structure of the outline. If the items are phrases, capitalize them sentence style (see 22.3.1) and do not use terminal punctuation. If they are complete sentences, capitalize and punctuate them as you would any other sentence (see 6.2.1 for an example).

I. Wars of the nineteenth century

A. United States

 1. Civil War, 1861—65

 a) Cause

  (1) Slavery

  (a) Compromise

   i) Missouri Compromise

   ii) Compromise of 1850 . . .

 b) Result

. . . . . . . . . . . . . . . . . . . . . . . . .

II. Wars of the twentieth century

A. United States

 1. First World War . . .