Cite

Anonymous. “Avanguardia futurista.” No source, [1920]. [1588-1]

MLA

Marinetti, F. T., 1876-1944. Anonymous. “Avanguardia futurista.” No source, [1920]. [1588-1]. box 21, slide 8. 1920. https://collections.library.yale.edu/catalog/10650824.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 21, slide 8"])(1920)[Anonymous. “Avanguardia futurista.” No source, [1920]. [1588-1]]. https://collections.library.yale.edu/catalog/10650824.