MLA
Certificate of Election for Albert Gallatin Brown, Senator in the Congress of the Confederate States of America, State of Mississippi; Document Signed by Governor John J. Pettus, and Secretary of State C. A. Brougher. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP1, Folder 1. https://digital.library.emory.edu/purl/996k0p2ppx-cor.
APA, 6th edition
Certificate of election for Albert Gallatin Brown, Senator in the Congress of the Confederate States of America, State of Mississippi; document signed by Governor John J. Pettus, and Secretary of State C. A. Brougher (OP1, Folder 1). (1862). [Certificates]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/996k0p2ppx-cor.
Chicago
“Certificate of Election for Albert Gallatin Brown, Senator in the Congress of the Confederate States of America, State of Mississippi; Document Signed by Governor John J. Pettus, and Secretary of State C. A. Brougher.” Certificates. Civil War Collection, 1862. OP1, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/996k0p2ppx-cor.