MLA

Marinetti, F. T., 1876-1944. XXX. “Hitler e l'arte contemporanea.” No source, [1937 or 38]. [9482-1]-[9486-1]. box 119, slide 62-66. 1937 or 1938. https://collections.library.yale.edu/catalog/10664715.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 119, slide 62-66"])(1937 or 1938)[XXX. “Hitler e l'arte contemporanea.” No source, [1937 or 38]. [9482-1]-[9486-1]]. https://collections.library.yale.edu/catalog/10664715.