Cite

Gaspare Casella. "Con Marinetti." No source. [05058-1]

MLA

Marinetti, F. T., 1876-1944. Gaspare Casella. "Con Marinetti." No source. [05058-1]. box 64, slide 38. no date. https://collections.library.yale.edu/catalog/10656697.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 64, slide 38"])(no date)[Gaspare Casella. "Con Marinetti." No source. [05058-1]]. https://collections.library.yale.edu/catalog/10656697.