MLA
Capers, William, 1790-1855. Letter from William Capers (Anderson, [South Carolina]) to Robert Paine (Aberdeen, Mississippi) - May 24, 1852. May 24, 1825. Robert Paine Papers, 1828-1882. Pitts Theology Library. https://digital.library.emory.edu/purl/474cnp5jw9-cor.
APA, 6th edition
Capers, William, 1790-1855. (May 24, 1825)[Letter from William Capers (Anderson, [South Carolina]) to Robert Paine (Aberdeen, Mississippi) - May 24, 1852]. Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/474cnp5jw9-cor.
Chicago
Capers, William, 1790-1855, Letter from William Capers (Anderson, [South Carolina]) to Robert Paine (Aberdeen, Mississippi) - May 24, 1852, May 24, 1825, Robert Paine Papers, 1828-1882, Pitts Theology Library. https://digital.library.emory.edu/purl/474cnp5jw9-cor.