MLA

Boswell, James, 1740-1795. Notes: Auchinleck (J 104). Box 46, folder 1020. 1787 Aug-Sep. https://collections.library.yale.edu/catalog/32501262.

APA, 6th edition

Boswell, James, 1740-1795. (["Box 46, folder 1020"])(1787 Aug-Sep)[Notes: Auchinleck (J 104)]. https://collections.library.yale.edu/catalog/32501262.