MLA
Confederate Officer William Dudley Gale, Son-in-Law and Aide to Confederate General Leonidas Polk. 1865. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 16, Folder 25. https://digital.library.emory.edu/purl/972p5hqcp1-cor.
APA, 6th edition
Confederate officer William Dudley Gale, son-in-law and aide to Confederate general Leonidas Polk (Box 16, Folder 25). (1865). [Cartes-de-visite (card photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqcp1-cor.
Chicago
“Confederate Officer William Dudley Gale, Son-in-Law and Aide to Confederate General Leonidas Polk.” Cartes-de-visite (card photographs). Civil War Collection, 1865. Box 16, Folder 25. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqcp1-cor.