To make a historical record findable and verifiable, you need a citation that identifies the record item, its location in the archive, and, if available, a stable online reference. Follow the National Archives’ guidelines to include the record title, date, file unit, series, subgroup, record group, repository, and any page or image numbers. This article explains why each element matters, how to assemble a complete citation, and what to watch out for when the record is only available online or as a microfilm.