MLA

Marinetti, F. T., 1876-1944. Francesco Cangiullo. “Poesia pentagrammata.” No source. Also discusses Marinetti's work. [2965-1]. box 38, slide 25. no date. https://collections.library.yale.edu/catalog/10653317.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 38, slide 25"])(no date)[Francesco Cangiullo. “Poesia pentagrammata.” No source. Also discusses Marinetti's work. [2965-1]]. https://collections.library.yale.edu/catalog/10653317.