MLA

Marinetti, F. T., 1876-1944. XXX. “Hitler e l'arte contemporanea.” No source, [1937 or 38]. [9360-1]-[9364-1]. box 118, slide 20-24. 1937 or 1938. https://collections.library.yale.edu/catalog/10664328.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 118, slide 20-24"])(1937 or 1938)[XXX. “Hitler e l'arte contemporanea.” No source, [1937 or 38]. [9360-1]-[9364-1]]. https://collections.library.yale.edu/catalog/10664328.