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In general, citations to textual records of Federal agencies should identify the record item, the file unit, the series, the subgroup, the record group, and the repository. Nontexual records may require that additional information be cited. As a rule, a citation to archival records should contain as much information as necessary to allow someone to easily locate those records.
Detailed guidelines are given in General Information Leaflet No. 17: Citing Records in the National Archives.
Suggestions for citing captured German and related records from World War II are given here: Suggestions for Citing NARA Microfilm of Captured German Records.