MLA

Marinetti, F. T., 1876-1944. T.A. Bracci and L.C. Fillia. “Gruppo artistico d'Avanguardia.” No source. [3166-1]. box 40, slide 66. no date. https://collections.library.yale.edu/catalog/10653686.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 40, slide 66"])(no date)[T.A. Bracci and L.C. Fillia. “Gruppo artistico d'Avanguardia.” No source. [3166-1]]. https://collections.library.yale.edu/catalog/10653686.