MLA

Nicholls, Norton, 1741?-1809. Norton Nicholls to Jane Floyer Nicholls. Milan. Concerns Milanese court; music. Box 1, folder 132. 1771 Dec 24. https://collections.library.yale.edu/catalog/17439929.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 1, folder 132"])(1771 Dec 24)[Norton Nicholls to Jane Floyer Nicholls. Milan. Concerns Milanese court; music]. https://collections.library.yale.edu/catalog/17439929.