MLA

Marinetti, F. T., 1876-1944. 255. FTM on a mule in a column of soldiers. Inscribed on verso: "F.T. Marinetti.". Box 51, folder 1954. 1935 October - 1936 April. https://collections.library.yale.edu/catalog/2009081.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 51, folder 1954"])(1935 October - 1936 April)[255. FTM on a mule in a column of soldiers. Inscribed on verso: "F.T. Marinetti."]. https://collections.library.yale.edu/catalog/2009081.