MLA

Cooper, James Fenimore, 1789-1851. Jay, William. Box 13, folder 363. 1854. https://collections.library.yale.edu/catalog/17073670.

APA, 6th edition

Cooper, James Fenimore, 1789-1851. (["Box 13, folder 363"])(1854)[Jay, William]. https://collections.library.yale.edu/catalog/17073670.