MLA

Marinetti, F. T., 1876-1944. L'Effort Moderne, avril 1926. With two 1926 illustrations by Giorgio de Chirico. [4314-1]. box 55, slide 14. 1926. https://collections.library.yale.edu/catalog/10655574.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 55, slide 14"])(1926)[L'Effort Moderne, avril 1926. With two 1926 illustrations by Giorgio de Chirico. [4314-1]]. https://collections.library.yale.edu/catalog/10655574.