MLA

Marinetti, F. T., 1876-1944. Autograph manuscript notes for "Improvisazione futurista". 2 p., written on telegram paper. Box 28, folder 1396. 1895-1944. https://collections.library.yale.edu/catalog/33277337.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 28, folder 1396"])(1895-1944)[Autograph manuscript notes for "Improvisazione futurista". 2 p., written on telegram paper]. https://collections.library.yale.edu/catalog/33277337.