346. FTM with some of the same people in n. 339.
MLA
Marinetti, F. T., 1876-1944. 346. FTM with some of the same people in n. 339.. Box 52, folder 1961. n.d.. https://collections.library.yale.edu/catalog/2009174.
APA, 6th edition
Marinetti, F. T., 1876-1944. (["Box 52, folder 1961"])(n.d.)[346. FTM with some of the same people in n. 339.]. https://collections.library.yale.edu/catalog/2009174.