Canto II
MLA
Bird, William, 1888-1963. Canto II. Box 2, folder 68. n.d.. https://collections.library.yale.edu/catalog/16164958.
APA, 6th edition
Bird, William, 1888-1963. (["Box 2, folder 68"])(n.d.)[Canto II]. https://collections.library.yale.edu/catalog/16164958.