Cite

Guillaume Apollinaire. “4 heures.” No source. [1299-1]

MLA

Marinetti, F. T., 1876-1944. Guillaume Apollinaire. “4 heures.” No source. [1299-1]. box 17, slide 39. no date. https://collections.library.yale.edu/catalog/10650524.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 17, slide 39"])(no date)[Guillaume Apollinaire. “4 heures.” No source. [1299-1]]. https://collections.library.yale.edu/catalog/10650524.