Archival research presents citation challenges that the Chicago Manual of Style addresses in general terms and that practice requires authors to resolve in specific ones. The gap between the manual's guidance and the reality of citing unpublished primary sources — manuscript collections, institutional records, correspondence, oral history recordings, government documents held in non-standard repositories, and the increasing volume of digitized archival material — is one that scholarly authors in history and the humanities navigate case by case, often without adequate models.
What follows is a set of practical principles for handling archival citations in Chicago NB style that will produce consistent, professionally formatted documentation across a range of source types.
Establish the citation hierarchy early. Archival citations in Chicago NB style follow a general hierarchy: item description, collection name, box and folder information (where applicable), and repository name and location. Not every element will be present for every source, but the order should be consistent throughout the manuscript. Authors who establish this hierarchy in a style sheet at the beginning of the project avoid the inconsistency that accumulates across a long manuscript when citation decisions are made ad hoc.
Handle collections and repositories with full information at first citation. At the first citation of any archival collection, provide the full name of the collection, the full name of the repository, and the repository's location. Subsequent citations may use abbreviated forms — a shortened collection name and the repository's standard abbreviation, if one exists — provided the full form is given at first use and the abbreviation is established explicitly.
Digitized archival material requires both the original source and the digital access information. When a primary source has been accessed through a digital repository — a digitized newspaper collection, a scanned manuscript collection, a government records database — the citation should identify the original source first, then provide the access information for the digital version. The URL or database name and the access date follow the original source information. Authors who cite only the digital access point and omit the original source information are producing citations that are formally incomplete and that will not survive a rigorous editorial review.
Oral history citations require specific elements. Oral history interviews cited in Chicago NB should include the name of the interviewee, the name of the interviewer if different from the author, the date of the interview, the format of the recording or transcript, and the repository where the recording or transcript is held. If the oral history collection has a formal name and call number, these should be included. Authors who have conducted their own interviews should note this clearly and should specify whether the recording, transcript, or both are available and where.
Develop a consistent treatment for undated and unsigned documents. Archival collections frequently contain documents without a clear date or attribution. Chicago style provides general guidance — "n.d." for undated documents, "Anonymous" or the descriptive label for unsigned ones — but authors working in collections where such documents are common should establish a consistent local practice in their style sheet rather than handling each case separately.
The investment in clean archival citations pays dividends throughout the research and writing process. A well-maintained citation record is also a research record — a systematic account of where the evidence came from and how it was accessed that serves the author long after the manuscript is submitted.
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