MLA

Boswell, James, 1740-1795. Correspondence. Box 121, folder 2237-38. 1727-43. https://collections.library.yale.edu/catalog/32246932.

APA, 6th edition

Boswell, James, 1740-1795. (["Box 121, folder 2237-38"])(1727-43)[Correspondence]. https://collections.library.yale.edu/catalog/32246932.