MLA

Marinetti, F. T., 1876-1944. 283. Venice? FTM presiding at a Congress. Inscribed on verso: "Presidenza del Congresso.". Box 51, folder 1956. 1938?. https://collections.library.yale.edu/catalog/2009108.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 51, folder 1956"])(1938?)[283. Venice? FTM presiding at a Congress. Inscribed on verso: "Presidenza del Congresso."]. https://collections.library.yale.edu/catalog/2009108.