"Elogio del Sonetto", autograph manuscript poem, signed. 1 p.
MLA
Marinetti, F. T., 1876-1944. "Elogio del Sonetto", autograph manuscript poem, signed. 1 p.. Box 47, folder 1864. 1900-1961. https://collections.library.yale.edu/catalog/16687059.
APA, 6th edition
Marinetti, F. T., 1876-1944. (["Box 47, folder 1864"])(1900-1961)["Elogio del Sonetto", autograph manuscript poem, signed. 1 p.]. https://collections.library.yale.edu/catalog/16687059.