MLA
Wesley, John, 1703-1791. Letter from John Wesley to Francis Wrigley, Scarborough - June 20, 1874. June 20, 1784. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/85370rxwz9-cor.
APA, 6th edition
Wesley, John, 1703-1791. (June 20, 1784)[Letter from John Wesley to Francis Wrigley, Scarborough - June 20, 1874]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/85370rxwz9-cor.
Chicago
Wesley, John, 1703-1791, Letter from John Wesley to Francis Wrigley, Scarborough - June 20, 1874, June 20, 1784, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/85370rxwz9-cor.