MLA

Nicholls, Norton, 1741?-1809. Norton Nicholls to Jane Floyer Nicholls. Cambridge. Concerns Cambridge University. Box 1, folder 27. 1760 Jul 9. https://collections.library.yale.edu/catalog/17439824.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 1, folder 27"])(1760 Jul 9)[Norton Nicholls to Jane Floyer Nicholls. Cambridge. Concerns Cambridge University]. https://collections.library.yale.edu/catalog/17439824.