MLA
Early, John, 1786-1873. Letter from John Early (Lynchburg, Virginia) to Robert Paine - August 27, 1871. August 27, 1871. Robert Paine Papers, 1828-1882. Pitts Theology Library. https://digital.library.emory.edu/purl/477sn02w99-cor.
APA, 6th edition
Early, John, 1786-1873. (August 27, 1871)[Letter from John Early (Lynchburg, Virginia) to Robert Paine - August 27, 1871]. Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/477sn02w99-cor.
Chicago
Early, John, 1786-1873, Letter from John Early (Lynchburg, Virginia) to Robert Paine - August 27, 1871, August 27, 1871, Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/477sn02w99-cor.