MLA

Marinetti, F. T., 1876-1944. Gaspar Miklos and Nicola Gaspar. “Dialogo con Marinetti.” No date, [1931]. [6728-1]-[6730-1]. box 85, slide 28-30. no date. https://collections.library.yale.edu/catalog/10659294.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 85, slide 28-30"])(no date)[Gaspar Miklos and Nicola Gaspar. “Dialogo con Marinetti.” No date, [1931]. [6728-1]-[6730-1]]. https://collections.library.yale.edu/catalog/10659294.