MLA

Marinetti, F. T., 1876-1944. Printed version, in unidentified newspaper (clipped and pasted to sheets of writing papers). Box 34, folder 1569. [ca. 1915]. https://collections.library.yale.edu/catalog/16687039.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["Box 34, folder 1569"])([ca. 1915])[Printed version, in unidentified newspaper (clipped and pasted to sheets of writing papers)]. https://collections.library.yale.edu/catalog/16687039.