MLA

Marinetti, F. T., 1876-1944. Unsigned article. “Mentre San Paolo aspetta Marinetti.” No source. [04792-1]. box 61, slide 12. no date. https://collections.library.yale.edu/catalog/10656315.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 61, slide 12"])(no date)[Unsigned article. “Mentre San Paolo aspetta Marinetti.” No source. [04792-1]]. https://collections.library.yale.edu/catalog/10656315.