MLA
Platen, Charles G. Diary Likely Written by Charles G. Platen. Platen Was Stationed at Sullivan's Island, South Carolina. The Diary Is Illustrated with a Few Sketches, Including a Rough Diagram of the Harbor Showing Location of Fortifications - November, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 5, Folder 46. https://digital.library.emory.edu/purl/279v15dw59-cor.
APA, 6th edition
Platen, C. G. (1863). Diary likely written by Charles G. Platen. Platen was stationed at Sullivan's Island, South Carolina. The diary is illustrated with a few sketches, including a rough diagram of the harbor showing location of fortifications - November, 1863 (Box 5, Folder 46) [Diaries]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/279v15dw59-cor.
Chicago
Platen, Charles G.[?]. “Diary Likely Written by Charles G. Platen. Platen Was Stationed at Sullivan's Island, South Carolina. The Diary Is Illustrated with a Few Sketches, Including a Rough Diagram of the Harbor Showing Location of Fortifications - November, 1863.” Diaries. Civil War Collection, 1863. Box 5, Folder 46. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/279v15dw59-cor.