MLA
Wesley, Sarah, 1759-1828. Letter from Sarah Wesley to [unaddressed], Marylebone [London] - November 22, [No Year]. November 22, year unknown. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/402q573nq5-cor.
APA, 6th edition
Wesley, Sarah, 1759-1828. (November 22, year unknown)[Letter from Sarah Wesley to [unaddressed], Marylebone [London] - November 22, [No Year]]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/402q573nq5-cor.
Chicago
Wesley, Sarah, 1759-1828, Letter from Sarah Wesley to [unaddressed], Marylebone [London] - November 22, [No Year], November 22, year unknown, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/402q573nq5-cor.