MLA

Morpurgo, Nelson, 1899-1978. "Marinetti il futurismo ed io". Box 1, folder 14. n.d.. https://collections.library.yale.edu/catalog/2109179.

APA, 6th edition

Morpurgo, Nelson, 1899-1978. (["Box 1, folder 14"])(n.d.)["Marinetti il futurismo ed io"]. https://collections.library.yale.edu/catalog/2109179.