MLA

Marinetti, F. T., 1876-1944. Typed letter from Lo Duca to Marinetti, dated 18 aout 1937, regarding a publication on Futursim. [8503-1]. box 107, slide 43. 1937. https://collections.library.yale.edu/catalog/10662782.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 107, slide 43"])(1937)[Typed letter from Lo Duca to Marinetti, dated 18 aout 1937, regarding a publication on Futursim. [8503-1]]. https://collections.library.yale.edu/catalog/10662782.