MLA
DeSaussure, Wilmot G. (Wilmot Gibbes), 1822-1886. Letter from Wilmot Gibbes De Saussure to "My Dear Sister" tells of the price of salt and wood - 1862. 1862. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/156zw3r33g-cor.
APA, 6th edition
DeSaussure, Wilmot G. (Wilmot Gibbes), 1822-1886. (1862)[Letter from Wilmot Gibbes De Saussure to "My Dear Sister" tells of the price of salt and wood - 1862]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/156zw3r33g-cor.
Chicago
DeSaussure, Wilmot G. (Wilmot Gibbes), 1822-1886, Letter from Wilmot Gibbes De Saussure to "My Dear Sister" tells of the price of salt and wood - 1862, 1862, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/156zw3r33g-cor.