MLA

Marinetti, F. T., 1876-1944. N. de Julio. “Novecentismo.” Sicilia Nostra, [1933 or 34]. Defends classicism and Futurism. [9075-1]. box 114, slide 55. 1934. https://collections.library.yale.edu/catalog/10663700.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 114, slide 55"])(1934)[N. de Julio. “Novecentismo.” Sicilia Nostra, [1933 or 34]. Defends classicism and Futurism. [9075-1]]. https://collections.library.yale.edu/catalog/10663700.