MLA

Marinetti, F. T., 1876-1944. Gerardo Diego. "Mar." Grecia, 1 Jul 1920. With "Mi poema no dedicado" by Maurice Claude. [2185-1]. box 28, slide 45. 1920. https://collections.library.yale.edu/catalog/10651722.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 28, slide 45"])(1920)[Gerardo Diego. "Mar." Grecia, 1 Jul 1920. With "Mi poema no dedicado" by Maurice Claude. [2185-1]]. https://collections.library.yale.edu/catalog/10651722.