MLA
Wesley, John, 1703-1791. Letter from John Wesley to Jane (Bisson) Cock (Jane Cork?), Leeds - August 3, 1789. August 3, 1789. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/467jq2bw63-cor.
APA, 6th edition
Wesley, John, 1703-1791. (August 3, 1789)[Letter from John Wesley to Jane (Bisson) Cock (Jane Cork?), Leeds - August 3, 1789]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/467jq2bw63-cor.
Chicago
Wesley, John, 1703-1791, Letter from John Wesley to Jane (Bisson) Cock (Jane Cork?), Leeds - August 3, 1789, August 3, 1789, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/467jq2bw63-cor.