MLA
Appointment Letter Appointing John T. Champney as Captain of Engineers Signed by Judah Phillip Benjamin, Confederate Secretary of War. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2, Folder 12. https://digital.library.emory.edu/purl/750tqjq3bd-cor.
APA, 6th edition
Appointment letter appointing John T. Champney as Captain of Engineers signed by Judah Phillip Benjamin, Confederate Secretary of War (Box 2, Folder 12). (1862). [Military commissions]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/750tqjq3bd-cor.
Chicago
“Appointment Letter Appointing John T. Champney as Captain of Engineers Signed by Judah Phillip Benjamin, Confederate Secretary of War.” Military commissions. Civil War Collection, 1862. Box 2, Folder 12. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/750tqjq3bd-cor.