MLA
Early, John, 1786-1873. Letter from John Early to Robert Paine - August 21, 1854. August 21, 1854. Robert Paine Papers, 1828-1882. Pitts Theology Library. https://digital.library.emory.edu/purl/9117m0ch46-cor.
APA, 6th edition
Early, John, 1786-1873. (August 21, 1854)[Letter from John Early to Robert Paine - August 21, 1854]. Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/9117m0ch46-cor.
Chicago
Early, John, 1786-1873, Letter from John Early to Robert Paine - August 21, 1854, August 21, 1854, Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/9117m0ch46-cor.