MLA

Marinetti, F. T., 1876-1944. Anonymous. “Capitolo IV: L'esperienza futurista.” No source, [1920]. Deals with Papini and Futurism. [1906-1]. box 25, slide 6. 1920. https://collections.library.yale.edu/catalog/10651370.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 25, slide 6"])(1920)[Anonymous. “Capitolo IV: L'esperienza futurista.” No source, [1920]. Deals with Papini and Futurism. [1906-1]]. https://collections.library.yale.edu/catalog/10651370.