MLA

Marinetti, F. T., 1876-1944. 307. Russia. FTM on train reading aloud to soldiers and nurses. Inscribed on verso in LMB's hand: "Aug 1942 FTM on way to Russia.". Box 51, folder 1958. 1942 Summer. https://collections.library.yale.edu/catalog/2009135.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 51, folder 1958"])(1942 Summer)[307. Russia. FTM on train reading aloud to soldiers and nurses. Inscribed on verso in LMB's hand: "Aug 1942 FTM on way to Russia."]. https://collections.library.yale.edu/catalog/2009135.