MLA

Marinetti, F. T., 1876-1944. Anonymous. “Inteligencia y congreso internacional de Escritores.” No source, 1936. [7802-1]. box 98, slide 62. 1936. https://collections.library.yale.edu/catalog/10661286.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 98, slide 62"])(1936)[Anonymous. “Inteligencia y congreso internacional de Escritores.” No source, 1936. [7802-1]]. https://collections.library.yale.edu/catalog/10661286.