MLA

Boswell, James, 1740-1795. Sasine. Box 82, folder 1570. 1513. https://collections.library.yale.edu/catalog/16043330.

APA, 6th edition

Boswell, James, 1740-1795. (["Box 82, folder 1570"])(1513)[Sasine]. https://collections.library.yale.edu/catalog/16043330.