MLA

Boswell, James, 1740-1795. Charter of Glenbervy. Box 79, folder 1555. 1466. https://collections.library.yale.edu/catalog/11977884.

APA, 6th edition

Boswell, James, 1740-1795. (["Box 79, folder 1555"])(1466)[Charter of Glenbervy]. https://collections.library.yale.edu/catalog/11977884.