MLA
Andrew, James O. (James Osgood), 1794-1871. Letter from James O. Andrews (Oxford, Georgia) to Robert Paine (Aberdeen, Mississippi) - May 27, 1853. May 27, 1853. Robert Paine Papers, 1828-1882. Pitts Theology Library. https://digital.library.emory.edu/purl/0752fqz73x-cor.
APA, 6th edition
Andrew, James O. (James Osgood), 1794-1871. (May 27, 1853)[Letter from James O. Andrews (Oxford, Georgia) to Robert Paine (Aberdeen, Mississippi) - May 27, 1853]. Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/0752fqz73x-cor.
Chicago
Andrew, James O. (James Osgood), 1794-1871, Letter from James O. Andrews (Oxford, Georgia) to Robert Paine (Aberdeen, Mississippi) - May 27, 1853, May 27, 1853, Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/0752fqz73x-cor.