MLA

Marinetti, F. T., 1876-1944. Emmanuel Aegerter. “Guillaume Apollinaire et la poésie contemporaine.” No source. [8793-1]-[8809-1]. box 111, slide 13-29. no date. https://collections.library.yale.edu/catalog/10663282.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 111, slide 13-29"])(no date)[Emmanuel Aegerter. “Guillaume Apollinaire et la poésie contemporaine.” No source. [8793-1]-[8809-1]]. https://collections.library.yale.edu/catalog/10663282.