Canto I
MLA
Bird, William, 1888-1963. Canto I. Box 2, folder 66. n.d.. https://collections.library.yale.edu/catalog/16164956.
APA, 6th edition
Bird, William, 1888-1963. (["Box 2, folder 66"])(n.d.)[Canto I]. https://collections.library.yale.edu/catalog/16164956.