MLA

Marinetti, F. T., 1876-1944. "Fiume", autograph manuscript essay, signed at the bottom of the last page. 20 p., including cover title, numbered 1-19.. Box 47, folder 1888. 1900-1961. https://collections.library.yale.edu/catalog/17303447.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 47, folder 1888"])(1900-1961)["Fiume", autograph manuscript essay, signed at the bottom of the last page. 20 p., including cover title, numbered 1-19.]. https://collections.library.yale.edu/catalog/17303447.