MLA
Bruyn, Joshua C. Diary Kept by Joshua C. Bruyn Who Served in the 1st Volunteer Regiment of Georgia from 1862-[1863] Rewritten in This Form in 1863 from Notes the Diary Gives a Detailed Account of the Siege of Fort Pulaski and Life as a Prisoner of War. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 41. https://digital.library.emory.edu/purl/262s4mw7q2-cor.
APA, 6th edition
Bruyn, J. C. (1863). Diary kept by Joshua C. Bruyn who served in the 1st Volunteer Regiment of Georgia from 1862-[1863] Rewritten in this form in 1863 from notes the diary gives a detailed account of the siege of Fort Pulaski and life as a prisoner of war (Box 1, Folder 41) [Diaries]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/262s4mw7q2-cor.
Chicago
Bruyn, Joshua C. “Diary Kept by Joshua C. Bruyn Who Served in the 1st Volunteer Regiment of Georgia from 1862-[1863] Rewritten in This Form in 1863 from Notes the Diary Gives a Detailed Account of the Siege of Fort Pulaski and Life as a Prisoner of War.” Diaries. Civil War Collection, 1863. Box 1, Folder 41. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/262s4mw7q2-cor.