MLA
Wesley, John, 1703-1791. Letter from John Wesley to "Peggy" Margaret (Dale) Avision, London - November 7, 1766. 1931. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/1741rn8q30-cor.
APA, 6th edition
Wesley, John, 1703-1791. (1931)[Letter from John Wesley to "Peggy" Margaret (Dale) Avision, London - November 7, 1766]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/1741rn8q30-cor.
Chicago
Wesley, John, 1703-1791, Letter from John Wesley to "Peggy" Margaret (Dale) Avision, London - November 7, 1766, 1931, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/1741rn8q30-cor.