MLA

Marinetti, F. T., 1876-1944. F.S. Flint. “F.T. Marinetti and 'Le Futurisme'.” [The Poetry Review, 1914]. [408-1]-[409-1]. box 6, slide 8-9. 1914. https://collections.library.yale.edu/catalog/10648917.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 6, slide 8-9"])(1914)[F.S. Flint. “F.T. Marinetti and 'Le Futurisme'.” [The Poetry Review, 1914]. [408-1]-[409-1]]. https://collections.library.yale.edu/catalog/10648917.