MLA

Nicholls, Norton, 1741?-1809. Norton Nicholls to Jane Floyer Nicholls. Cambridge. Concerns Cambridge University.. Box 1, folder 59. 1767 May 28. https://collections.library.yale.edu/catalog/17439856.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 1, folder 59"])(1767 May 28)[Norton Nicholls to Jane Floyer Nicholls. Cambridge. Concerns Cambridge University.]. https://collections.library.yale.edu/catalog/17439856.