MLA

Nicholls, Norton, 1741?-1809. Thomas Gray to Norton Nicholls. Cambridge. Concerns Charles de Bonstetten; gardening. Box 1, folder 95. 1770 Apr 14. https://collections.library.yale.edu/catalog/17439892.

APA, 6th edition

Nicholls, Norton, 1741?-1809. (["Box 1, folder 95"])(1770 Apr 14)[Thomas Gray to Norton Nicholls. Cambridge. Concerns Charles de Bonstetten; gardening]. https://collections.library.yale.edu/catalog/17439892.