MLA
Wesley, Charles, 1757-1834. Letter from Charles Wesley junior to Her Royal Highness the Princess Charlotte of Wales - [written between 1801 and 1817]. between 1801 and 1817. Wesleyana Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/003cz8wb14-cor.
APA, 6th edition
Wesley, Charles, 1757-1834. (between 1801 and 1817)[Letter from Charles Wesley junior to Her Royal Highness the Princess Charlotte of Wales - [written between 1801 and 1817]]. Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/003cz8wb14-cor.
Chicago
Wesley, Charles, 1757-1834, Letter from Charles Wesley junior to Her Royal Highness the Princess Charlotte of Wales - [written between 1801 and 1817], between 1801 and 1817, Wesleyana Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/003cz8wb14-cor.