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

Letters and other communications in published collections
Notes-bibliography style: citing specific types of sources
Part II. Source Citation

You may cite specific parts of books that collect letters, memoranda, and other communications because a specific reference provides information not included in a whole book citation, such as the date and participants for an individual communication. (For unpublished personal communications, see 17.6.3; for unpublished letters in manuscript collections, see 17.6.4.)

To cite such an item, give the names of the sender and recipient, followed by a date and (if available and relevant) the place where the communication was prepared. The word letter is unnecessary, but label other forms, such as a report or memorandum. Give the title and other data for the collection in the usual form for an edited book. Notice the form for a shortened note, which differs from the usual pattern of elements.

N: 1. Adams to Charles Milnes Gaskell, London, March 30, 1896, in Letters of Henry Adams, 1858—1891, ed. Worthington Chauncey Ford (Boston: Houghton Mifflin, 1930), 141.

2. Adams to Gaskell, 142.

5. EBW to Harold Ross, memorandum, May 2, 1946, in Letters of E. B. White, ed. Dorothy Lobrano Guth (New York: Harper & Row, 1976), 273.

B: Jackson, Paulina. Paulina Jackson to John Pepys Junior, October 3, 1676. In The Letters of Samuel Pepys and His Family Circle, edited by Helen Truesdell Heath, no. 42. Oxford: Clarendon Press, 1955.

If you cite several letters or other communications from a single book in your notes, list just the book rather than the individual pieces in your bibliography.

B: Churchill, Winston, and Dwight D. Eisenhower. The Churchill-Eisenhower Correspondence, 1953—1955, edited by Peter G. Boyle. Chapel Hill: University of North Carolina Press, 1990.