MLA

Hogg, James, 1770-1835. JOCK ARMSTRONG: autograph MS tale. Box 1, folder 24. n.d.. https://collections.library.yale.edu/catalog/16440532.

APA, 6th edition

Hogg, James, 1770-1835. (["Box 1, folder 24"])(n.d.)[JOCK ARMSTRONG: autograph MS tale]. https://collections.library.yale.edu/catalog/16440532.