MLA

Marinetti, F. T., 1876-1944. Jorge Luis Borges. “Hermanos.” Grecia, 1 Jul 1920. With "Es en vano" by Luciano San-Saqr. [2188-1] “Hermanos.”. box 28, slide 48. 1920. https://collections.library.yale.edu/catalog/10651725.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 28, slide 48"])(1920)[Jorge Luis Borges. “Hermanos.” Grecia, 1 Jul 1920. With "Es en vano" by Luciano San-Saqr. [2188-1] “Hermanos.”]. https://collections.library.yale.edu/catalog/10651725.