MLA

Marinetti, F. T., 1876-1944. Vincete Huidobro. "Cowboy." From a dadaist publication, text in French, dedicated to Jacques Lipschitz. ; Publicity for Dada 1, Dada 2, Dada 3.. box 2, slide 25. no date. https://collections.library.yale.edu/catalog/10648290.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 2, slide 25"])(no date)[Vincete Huidobro. "Cowboy." From a dadaist publication, text in French, dedicated to Jacques Lipschitz. ; Publicity for Dada 1, Dada 2, Dada 3.]. https://collections.library.yale.edu/catalog/10648290.