Erskine, John (C 1220=1220.3)
MLA
Boswell, James, 1740-1795. Erskine, John (C 1220=1220.3). Box 21, folder 505. 1791-93. https://collections.library.yale.edu/catalog/2038817.
APA, 6th edition
Boswell, James, 1740-1795. (["Box 21, folder 505"])(1791-93)[Erskine, John (C 1220=1220.3)]. https://collections.library.yale.edu/catalog/2038817.