MLA

Marinetti, F. T., 1876-1944. Unsigned article. "De Artes y Letras." Anales de la Academia Nacional, [1920]. [2382-1]. box 31, slide 2. 1920. https://collections.library.yale.edu/catalog/10652059.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 31, slide 2"])(1920)[Unsigned article. "De Artes y Letras." Anales de la Academia Nacional, [1920]. [2382-1]]. https://collections.library.yale.edu/catalog/10652059.