MLA
Doremus, J. E. C. Letter from Presbyterian Minister, J. E. C. Daraemus (Parsonage, Rosedale, Louisiana) to Messrs. Martien and Company, Philadelphia Publishers - May 4, 1861. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 3, Folder. https://digital.library.emory.edu/purl/566j0zpd89-cor.
APA, 6th edition
Doremus, J. E. C. (1861). Letter from Presbyterian minister, J. E. C. Daraemus (Parsonage, Rosedale, Louisiana) to Messrs. Martien and Company, Philadelphia publishers - May 4, 1861 (Box 3, Folder) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/566j0zpd89-cor.
Chicago
Doremus, J. E. C. “Letter from Presbyterian Minister, J. E. C. Daraemus (Parsonage, Rosedale, Louisiana) to Messrs. Martien and Company, Philadelphia Publishers - May 4, 1861.” Letters (correspondence). Civil War Collection, 1861. Box 3, Folder. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/566j0zpd89-cor.