MLA

Marinetti, F. T., 1876-1944. "Manifesto degli operai futuristi", autograph manuscript manifesto, signed. 5 p., numbered 1-5.. Box 47, folder 1866. 1900-1961. https://collections.library.yale.edu/catalog/2064362.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 47, folder 1866"])(1900-1961)["Manifesto degli operai futuristi", autograph manuscript manifesto, signed. 5 p., numbered 1-5.]. https://collections.library.yale.edu/catalog/2064362.