MLA

Marinetti, F. T., 1876-1944. Letter from the President of Accademia Reale d'Italia to Marinetti thanking him for his conference. Roma, 15 aprile 1942. [10331-1]. box 130, slide 31. 1942. https://collections.library.yale.edu/catalog/10666500.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 130, slide 31"])(1942)[Letter from the President of Accademia Reale d'Italia to Marinetti thanking him for his conference. Roma, 15 aprile 1942. [10331-1]]. https://collections.library.yale.edu/catalog/10666500.