MLA

Marinetti, F. T., 1876-1944. Autograph manuscript draft of an essay in French, with corrections, and other notes, some referring to Poesia. 20 p., numbered 2-8, missing page 1.. Box 38, folder 1671. 1895-1944. https://collections.library.yale.edu/catalog/17303445.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 38, folder 1671"])(1895-1944)[Autograph manuscript draft of an essay in French, with corrections, and other notes, some referring to Poesia. 20 p., numbered 2-8, missing page 1.]. https://collections.library.yale.edu/catalog/17303445.