MLA
Marston, William W. 26-Page Diary of Assistant Surgeon William W. Marston, 12th North Carolina Infantry Regiment Diary Tells of His Participation in Gettysburg Campaign - May 14 - August 8, 1863 (Photocopy). 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 59. https://digital.library.emory.edu/purl/013mw6mb1w-cor.
APA, 6th edition
Marston, W. W. (1863). 26-page diary of Assistant Surgeon William W. Marston, 12th North Carolina Infantry Regiment Diary tells of his participation in Gettysburg Campaign - May 14 - August 8, 1863 (photocopy) (Box 4, Folder 59) [Diaries]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/013mw6mb1w-cor.
Chicago
Marston, William W. “26-Page Diary of Assistant Surgeon William W. Marston, 12th North Carolina Infantry Regiment Diary Tells of His Participation in Gettysburg Campaign - May 14 - August 8, 1863 (Photocopy).” Diaries. Civil War Collection, 1863. Box 4, Folder 59. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/013mw6mb1w-cor.