Landsdowne, William Petty, 1st M. of (L 850)
MLA
Boswell, James, 1740-1795. Landsdowne, William Petty, 1st M. of (L 850). Box 5, folder 159. 1791. https://collections.library.yale.edu/catalog/2038579.
APA, 6th edition
Boswell, James, 1740-1795. (["Box 5, folder 159"])(1791)[Landsdowne, William Petty, 1st M. of (L 850)]. https://collections.library.yale.edu/catalog/2038579.