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

Date of publication
Parenthetical citations–reference list style: citing specific types of sources
Part II. Source Citation

The publication date for a book consists only of a year, not a month or day, and is usually identical to the copyright date. It generally appears on the copyright page and sometimes on the title page.

In a reference list entry, set off the date as its own element with periods. In a parenthetical citation, put it after the author's name without intervening punctuation.

R: Ginsborg, Paul. 2005. The politics of everyday life: Making choices, changing lives. New Haven: Yale University Press.

P: (Ginsborg 2005, 53)

Revised editions and reprints may include more than one copyright date. In this case, the most recent indicates the publication date—for example, 2003 in the string “© 1982, 1992, 2003.” See 19.1.4 for citing publication dates in such works.

If you cannot determine the publication date of a printed work, use the abbreviation n.d. in place of the year. If no date is provided but you believe you know it, you may add it in brackets, with a question mark to indicate uncertainty.

R: Smith, John. n.d. A book of virtues. Edinburgh.

Miller, Samuel. [1750?]. Another book of virtues. Boston.

P: (Smith n.d., 5)

(Miller [1750?], 5)

If a book is under contract with a publisher and is already titled, but the date of publication is not yet known, use forthcoming in place of the date. To avoid confusion, include a comma after the author's name in a parenthetical citation of this type. Treat any book not yet under contract as an unpublished manuscript (see 19.6).

R: Author, Jane Q. Forthcoming. Book title. Place of Publication: Publisher's Name.

P: (Author, forthcoming, 16)