MLA
Wesley, Charles, 1757-1834. Letter from Charles Wesley to [Sarah (Gwynne)] Wesley, Dunstable - August 18, 1801 (2). August 18, 1801. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/631cjsxmb3-cor.
APA, 6th edition
Wesley, Charles, 1757-1834. (August 18, 1801)[Letter from Charles Wesley to [Sarah (Gwynne)] Wesley, Dunstable - August 18, 1801 (2)]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/631cjsxmb3-cor.
Chicago
Wesley, Charles, 1757-1834, Letter from Charles Wesley to [Sarah (Gwynne)] Wesley, Dunstable - August 18, 1801 (2), August 18, 1801, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/631cjsxmb3-cor.