MLA

Marinetti, F. T., 1876-1944. 240. Naples. FTM leaving for Ethiopia. BCM behind him. Inscribed on verso in LMB's hand: "FTM and BCM when FTM left for Ethiopia." Photo processed in Naples.. Box 51, folder 1954. 1935 Oct. https://collections.library.yale.edu/catalog/2009067.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 51, folder 1954"])(1935 Oct)[240. Naples. FTM leaving for Ethiopia. BCM behind him. Inscribed on verso in LMB's hand: "FTM and BCM when FTM left for Ethiopia." Photo processed in Naples.]. https://collections.library.yale.edu/catalog/2009067.