MLA

Nicholls, Norton, 1741?-1809. John Minifie to Norton Nicholls. Trezzo. Concerns Milanese court; Norton Nicholls. Box 2, folder 149. 1772 May 30. https://collections.library.yale.edu/catalog/17439946.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 2, folder 149"])(1772 May 30)[John Minifie to Norton Nicholls. Trezzo. Concerns Milanese court; Norton Nicholls]. https://collections.library.yale.edu/catalog/17439946.