Subscribe to The Chicago Manual of Style Online
Citation, Documentation of Sources
Q. I have a question about citing archival documents for an organization whose name has changed. The records in the archive are under one name, but the name during the period discussed in the paper was another name. We want to ensure that readers can get back to the actual documents. One option we discussed is including text in the first note that explains this difference in names.
A. Exactly. Explain in a note or as an annotation to the citation itself. Withhold the information only if you wish to cause confusion and wild goose chases.