1:4
MLA
Pound, Ezra, 1885-1972. 1:4. Box 204, folder 7658. 1905 1971. https://collections.library.yale.edu/catalog/2042281.
APA, 6th edition
Pound, Ezra, 1885-1972. (["Box 204, folder 7658"])(1905 1971)[1:4]. https://collections.library.yale.edu/catalog/2042281.