[Letter: to Thomas Secker, Bishop of Oxford]
MLA
Marlborough, Sarah Jennings Churchill, Duchess of, 1660-1744. [Letter: to Thomas Secker, Bishop of Oxford]. Box 1 | Folder 11. 1742 September 27. https://collections.library.yale.edu/catalog/9998678.
APA, 6th edition
Marlborough, Sarah Jennings Churchill, Duchess of, 1660-1744. (["Box 1 | Folder 11"])(1742 September 27)[[Letter: to Thomas Secker, Bishop of Oxford]]. https://collections.library.yale.edu/catalog/9998678.