MLA

Marinetti, F. T., 1876-1944. Filippo Tommaso Marinetti. Article in Spanish on Boccioni. No source, date. With three photos. [422-1]. box 6, slide 22. 1914. https://collections.library.yale.edu/catalog/10648931.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 6, slide 22"])(1914)[Filippo Tommaso Marinetti. Article in Spanish on Boccioni. No source, date. With three photos. [422-1]]. https://collections.library.yale.edu/catalog/10648931.