MLA
Kavanaugh, H. H. (Hubbard Hinde), 1802-1884. Letter from H. H. Kavanaugh (Camden, Arkansas) to Robert Paine - December 4, 1854. December 4, 1854. Robert Paine Papers, 1828-1882. Pitts Theology Library. https://digital.library.emory.edu/purl/576rxwdczc-cor.
APA, 6th edition
Kavanaugh, H. H. (Hubbard Hinde), 1802-1884. (December 4, 1854)[Letter from H. H. Kavanaugh (Camden, Arkansas) to Robert Paine - December 4, 1854]. Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/576rxwdczc-cor.
Chicago
Kavanaugh, H. H. (Hubbard Hinde), 1802-1884, Letter from H. H. Kavanaugh (Camden, Arkansas) to Robert Paine - December 4, 1854, December 4, 1854, Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/576rxwdczc-cor.