MLA

Mason, William Smith, 1866-. Benjamin Franklin, John Jay: document appointing William T. Franklin as Secretary to the American Commission negotiating a peace treaty. Box 67 (Oversize). 1782 October 1. https://collections.library.yale.edu/catalog/2014096.

APA, 6th edition

Mason, William Smith, 1866-. (["Box 67 (Oversize)"])(1782 October 1)[Benjamin Franklin, John Jay: document appointing William T. Franklin as Secretary to the American Commission negotiating a peace treaty]. https://collections.library.yale.edu/catalog/2014096.