MLA

Boswell, James, 1806-1857. Boswell, Hamilton Douglas. Box 10, folder 311-312. 1880-84, n.d.. https://collections.library.yale.edu/catalog/17458322.

APA, 6th edition

Boswell, James, 1806-1857. (["Box 10, folder 311-312"])(1880-84, n.d.)[Boswell, Hamilton Douglas]. https://collections.library.yale.edu/catalog/17458322.