MLA

Boswell, James, 1740-1795. Charter. Box 80, folder 1563. n.d.. https://collections.library.yale.edu/catalog/11977876.

APA, 6th edition

Boswell, James, 1740-1795. (["Box 80, folder 1563"])(n.d.)[Charter]. https://collections.library.yale.edu/catalog/11977876.