MLA

Marinetti, F. T., 1876-1944. Umberto Clementelli. "Avanguardie Straniere e italiane." No source, [1928]. [5608-1]-[5609-1]. box 71, slide 28-29. 1928. https://collections.library.yale.edu/catalog/10657523.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 71, slide 28-29"])(1928)[Umberto Clementelli. "Avanguardie Straniere e italiane." No source, [1928]. [5608-1]-[5609-1]]. https://collections.library.yale.edu/catalog/10657523.