MLA

Marinetti, F. T., 1876-1944. Alessandro de Stefani. "Vent'anni meno. Novella di Alessandro de Stefani." No source. [04873-1]. box 62, slide 13. no date. https://collections.library.yale.edu/catalog/10656428.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 62, slide 13"])(no date)[Alessandro de Stefani. "Vent'anni meno. Novella di Alessandro de Stefani." No source. [04873-1]]. https://collections.library.yale.edu/catalog/10656428.