MLA

Boswell, James, 1740-1795. Charter. Box 121, folder 2245. 1658. https://collections.library.yale.edu/catalog/32246983.

APA, 6th edition

Boswell, James, 1740-1795. (["Box 121, folder 2245"])(1658)[Charter]. https://collections.library.yale.edu/catalog/32246983.