MLA

Marinetti, F. T., 1876-1944. Stanislaw Heluztydaki. "Tragiczna Milosc Lorda Byrona." Wladomosci Literackie, 1929. [5435-1]. box 69, slide 15. 1929. https://collections.library.yale.edu/catalog/10657289.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 69, slide 15"])(1929)[Stanislaw Heluztydaki. "Tragiczna Milosc Lorda Byrona." Wladomosci Literackie, 1929. [5435-1]]. https://collections.library.yale.edu/catalog/10657289.