MLA

Marinetti, F. T., 1876-1944. Unsigned and untitled article. No source, 26 ago 1920. Deals with the Futurist theatre. [2270-1]. box 29, slide 50. 1920. https://collections.library.yale.edu/catalog/10651863.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 29, slide 50"])(1920)[Unsigned and untitled article. No source, 26 ago 1920. Deals with the Futurist theatre. [2270-1]]. https://collections.library.yale.edu/catalog/10651863.