MLA
Wesley, Charles, 1757-1834. Letter to Charles Wesley junior to Sarah Wesley - March 9, [No Year]. March 9, year unknown. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/197xksn0n1-cor.
APA, 6th edition
Wesley, Charles, 1757-1834. (March 9, year unknown)[Letter to Charles Wesley junior to Sarah Wesley - March 9, [No Year]]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/197xksn0n1-cor.
Chicago
Wesley, Charles, 1757-1834, Letter to Charles Wesley junior to Sarah Wesley - March 9, [No Year], March 9, year unknown, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/197xksn0n1-cor.