MLA

Marinetti, F. T., 1876-1944. Anonymous. "La conferencia de Marinetti en El Ateneo." El Liberal, 24 feb. 1928. [5579-1]. box 70, slide 79. 1928. https://collections.library.yale.edu/catalog/10657494.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 70, slide 79"])(1928)[Anonymous. "La conferencia de Marinetti en El Ateneo." El Liberal, 24 feb. 1928. [5579-1]]. https://collections.library.yale.edu/catalog/10657494.