MLA

Marinetti, F. T., 1876-1944. Anonymous. “Una campana futurista en Buenos Aires.” Plus Ultra (Buenos Aires), 1925. [3968-1]. box 50, slide 68. 1925. https://collections.library.yale.edu/catalog/10655020.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 50, slide 68"])(1925)[Anonymous. “Una campana futurista en Buenos Aires.” Plus Ultra (Buenos Aires), 1925. [3968-1]]. https://collections.library.yale.edu/catalog/10655020.