MLA

Cooper, James Fenimore, 1789-1851. Bryant, William Cullen. Box 13, folder 352. 1854. https://collections.library.yale.edu/catalog/17073662.

APA, 6th edition

Cooper, James Fenimore, 1789-1851. (["Box 13, folder 352"])(1854)[Bryant, William Cullen]. https://collections.library.yale.edu/catalog/17073662.