MLA

Boswell, James, 1740-1795. "Full trial of my fortune at the English Bar" (J 101). Box 46, folder 1019. 1786 Sep-Nov. https://collections.library.yale.edu/catalog/32501259.

APA, 6th edition

Boswell, James, 1740-1795. (["Box 46, folder 1019"])(1786 Sep-Nov)["Full trial of my fortune at the English Bar" (J 101)]. https://collections.library.yale.edu/catalog/32501259.