MLA

Boswell, James, 1740-1795. Charter for Cochrane. Box 121, folder 2244. 1657. https://collections.library.yale.edu/catalog/32246980.

APA, 6th edition

Boswell, James, 1740-1795. (["Box 121, folder 2244"])(1657)[Charter for Cochrane]. https://collections.library.yale.edu/catalog/32246980.