MLA
Wesley, Sarah (Gwynne), 1726-1822. Letter from Sarah (Gwynne) Wesley to Sarah Wesley - February 2, 1782. February 2, 1782. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/941zcrjf0f-cor.
APA, 6th edition
Wesley, Sarah (Gwynne), 1726-1822. (February 2, 1782)[Letter from Sarah (Gwynne) Wesley to Sarah Wesley - February 2, 1782]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/941zcrjf0f-cor.
Chicago
Wesley, Sarah (Gwynne), 1726-1822, Letter from Sarah (Gwynne) Wesley to Sarah Wesley - February 2, 1782, February 2, 1782, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/941zcrjf0f-cor.