MLA
Polk, Leonidas, 1806-1864. Letter from Confederate General Leonidas Polk (Fort Pillow, Tennessee) to [Confederate General Gideon J. Pillow] regarding fortification of Island No. 10 on the Mississippi River - August 17, 1861. August 17, 1861. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/020fttf01d-cor.
APA, 6th edition
Polk, Leonidas, 1806-1864. (August 17, 1861)[Letter from Confederate General Leonidas Polk (Fort Pillow, Tennessee) to [Confederate General Gideon J. Pillow] regarding fortification of Island No. 10 on the Mississippi River - August 17, 1861]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/020fttf01d-cor.
Chicago
Polk, Leonidas, 1806-1864, Letter from Confederate General Leonidas Polk (Fort Pillow, Tennessee) to [Confederate General Gideon J. Pillow] regarding fortification of Island No. 10 on the Mississippi River - August 17, 1861, August 17, 1861, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/020fttf01d-cor.