MLA
Peed, Washington Franklin. Letter from Washington Franklin Peed (Helena, Arkanasas) to His Wife, Elizabeth Peed. Peed Was a Private in the 24th Indiana Infantry Regiment and Died in 1863 at the Military Hospital in Helena, Arkansas. The Note Written on Top of the Letter Was Written by Mary, Daughter of Washington Franklin Peed and Elizabeth Peed - December 25, 1862 (Photocopy). 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 20, Folder 8. https://digital.library.emory.edu/purl/7547pvmf16-cor.
APA, 6th edition
Peed, W. F. (1862). Letter from Washington Franklin Peed (Helena, Arkanasas) to his wife, Elizabeth Peed. Peed was a private in the 24th Indiana Infantry Regiment and died in 1863 at the military hospital in Helena, Arkansas. The note written on top of the letter was written by Mary, daughter of Washington Franklin Peed and Elizabeth Peed - December 25, 1862 (photocopy) (Box 20, Folder 8) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7547pvmf16-cor.
Chicago
Peed, Washington Franklin. “Letter from Washington Franklin Peed (Helena, Arkanasas) to His Wife, Elizabeth Peed. Peed Was a Private in the 24th Indiana Infantry Regiment and Died in 1863 at the Military Hospital in Helena, Arkansas. The Note Written on Top of the Letter Was Written by Mary, Daughter of Washington Franklin Peed and Elizabeth Peed - December 25, 1862 (Photocopy).” Letters (correspondence). Civil War Collection, 1862. Box 20, Folder 8. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7547pvmf16-cor.