"Sing those who may"
MLA
Boswell, James, 1740-1795. "Sing those who may". Box 59, folder 1249. 1786. https://collections.library.yale.edu/catalog/16629129.
APA, 6th edition
Boswell, James, 1740-1795. (["Box 59, folder 1249"])(1786)["Sing those who may"]. https://collections.library.yale.edu/catalog/16629129.