MLA

Marinetti, F. T., 1876-1944. Massimo Bontempelli. “Giustificazione.” No source. Article written for the periodical 900. [04937-1]. box 62, slide 77. no date. https://collections.library.yale.edu/catalog/10656543.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 62, slide 77"])(no date)[Massimo Bontempelli. “Giustificazione.” No source. Article written for the periodical 900. [04937-1]]. https://collections.library.yale.edu/catalog/10656543.