Cite

Anonymous. “Silvio Mix.” No source. [3979-1]

MLA

Marinetti, F. T., 1876-1944. Anonymous. “Silvio Mix.” No source. [3979-1]. box 50, slide 79. no date. https://collections.library.yale.edu/catalog/10655037.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 50, slide 79"])(no date)[Anonymous. “Silvio Mix.” No source. [3979-1]]. https://collections.library.yale.edu/catalog/10655037.