MLA

Nicholls, Norton, 1741?-1809. Norton Nicholls to Jane Floyer Nicholls. Malmhead. Concerns William Johnson Temple. Box 1, folder 43. [1764] Aug 30. https://collections.library.yale.edu/catalog/17439840.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 1, folder 43"])([1764] Aug 30)[Norton Nicholls to Jane Floyer Nicholls. Malmhead. Concerns William Johnson Temple]. https://collections.library.yale.edu/catalog/17439840.