MLA

Nicholls, Norton, 1741?-1809. Norton Nicholls to Jane Floyer Nicholls. Cambridge. Concerns Cambridge University. Box 1, folder 30. 1762 Mar 7. https://collections.library.yale.edu/catalog/17439827.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 1, folder 30"])(1762 Mar 7)[Norton Nicholls to Jane Floyer Nicholls. Cambridge. Concerns Cambridge University]. https://collections.library.yale.edu/catalog/17439827.