MLA
Cooke, Matthew, 1761?-1829. Letter from Matthew Cooke to Charles Wesley junior - July 10, [No Year]. July 10, year unknown. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/610wpzgncq-cor.
APA, 6th edition
Cooke, Matthew, 1761?-1829. (July 10, year unknown)[Letter from Matthew Cooke to Charles Wesley junior - July 10, [No Year]]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/610wpzgncq-cor.
Chicago
Cooke, Matthew, 1761?-1829, Letter from Matthew Cooke to Charles Wesley junior - July 10, [No Year], July 10, year unknown, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/610wpzgncq-cor.