MLA
Strawn, Benjamin. Letter from Benjamin Strawn (General Barracks, U. S. Hospital, New Orleans, Louisiana) to His Mother, Sarah Strawn. Strawn Was a Member of the 38th Iowa Infantry Regiment - September 18, 1863 (Typescript). 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 20, Folder 28. https://digital.library.emory.edu/purl/791sf7m1jk-cor.
APA, 6th edition
Strawn, B. (1863). Letter from Benjamin Strawn (General Barracks, U. S. Hospital, New Orleans, Louisiana) to his mother, Sarah Strawn. Strawn was a member of the 38th Iowa Infantry Regiment - September 18, 1863 (typescript) (Box 20, Folder 28) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/791sf7m1jk-cor.
Chicago
Strawn, Benjamin. “Letter from Benjamin Strawn (General Barracks, U. S. Hospital, New Orleans, Louisiana) to His Mother, Sarah Strawn. Strawn Was a Member of the 38th Iowa Infantry Regiment - September 18, 1863 (Typescript).” Letters (correspondence). Civil War Collection, 1863. Box 20, Folder 28. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/791sf7m1jk-cor.