MLA

Nicholls, Norton, 1741?-1809. John Minifie to Norton Nicholls. Trezzo. Concerns Scotland; Charles de Bonstetten; Milanese court. Box 2, folder 219. 1774 May 29. https://collections.library.yale.edu/catalog/17440016.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 2, folder 219"])(1774 May 29)[John Minifie to Norton Nicholls. Trezzo. Concerns Scotland; Charles de Bonstetten; Milanese court]. https://collections.library.yale.edu/catalog/17440016.