MLA

Marinetti, F. T., 1876-1944. One page with unidentified text. Three caricatures about readers of novels. No source. [9332-1]. box 117, slide 72. no date. https://collections.library.yale.edu/catalog/10664246.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 117, slide 72"])(no date)[One page with unidentified text. Three caricatures about readers of novels. No source. [9332-1]]. https://collections.library.yale.edu/catalog/10664246.