MLA

Nicholls, Norton, 1741?-1809. Norton Nicholls to Jane Floyer Nicholls. Ditchleys. Concerns family health; Augustus Floyer. Box 2, folder 218. 1774 May 11. https://collections.library.yale.edu/catalog/17440015.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 2, folder 218"])(1774 May 11)[Norton Nicholls to Jane Floyer Nicholls. Ditchleys. Concerns family health; Augustus Floyer]. https://collections.library.yale.edu/catalog/17440015.