MLA

Nicholls, Norton, 1741?-1809. Norton Nicholls to Jane Floyer Nicholls. Murrill Green. Concerns Richard Owen Cambridge. Box 1, folder 42. [1764]. https://collections.library.yale.edu/catalog/17439839.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 1, folder 42"])([1764])[Norton Nicholls to Jane Floyer Nicholls. Murrill Green. Concerns Richard Owen Cambridge]. https://collections.library.yale.edu/catalog/17439839.