MLA

Marinetti, F. T., 1876-1944. "Energia futurista italiana..." first words of an autograph manuscript essay. 4 p.. Box 46, folder 1805. 1900-1961. https://collections.library.yale.edu/catalog/16687057.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 46, folder 1805"])(1900-1961)["Energia futurista italiana..." first words of an autograph manuscript essay. 4 p.]. https://collections.library.yale.edu/catalog/16687057.