MLA

Marinetti, F. T., 1876-1944. [Henry Newbolt]. “Futurism and Form in Poetry.” The Fortnightly Review, May 1914. [415-1]-[421-1]. box 6, slide 15-21. 1914. https://collections.library.yale.edu/catalog/10648924.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 6, slide 15-21"])(1914)[[Henry Newbolt]. “Futurism and Form in Poetry.” The Fortnightly Review, May 1914. [415-1]-[421-1]]. https://collections.library.yale.edu/catalog/10648924.