MLA
Envelope from Unidentified Person to Robert Paine (Aberdeen, Mississippi). Pitts Theology Library, Box 1, Folder 23. https://digital.library.emory.edu/purl/402q573pbf-cor.
APA, 6th edition
Envelope from unidentified person to Robert Paine (Aberdeen, Mississippi) (Box 1, Folder 23). [Letters (correspondence)]. Pitts Theology Library. https://digital.library.emory.edu/purl/402q573pbf-cor.
Chicago
“Envelope from Unidentified Person to Robert Paine (Aberdeen, Mississippi).” Letters (correspondence). Robert Paine Papers, 1828-1882, n.d. Box 1, Folder 23. Pitts Theology Library. https://digital.library.emory.edu/purl/402q573pbf-cor.