MLA
Wesley, John, 1703-1791. Letter from John Wesley to Sarah Wesley, Manchester - April 12, 1788. April 12, 1788. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/7203xsj4c2-cor.
APA, 6th edition
Wesley, John, 1703-1791. (April 12, 1788)[Letter from John Wesley to Sarah Wesley, Manchester - April 12, 1788]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/7203xsj4c2-cor.
Chicago
Wesley, John, 1703-1791, Letter from John Wesley to Sarah Wesley, Manchester - April 12, 1788, April 12, 1788, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/7203xsj4c2-cor.