MLA

Asch, Sholem, 1880-1957. Speech in PEN News. Box 13, folder 148. 1934 Feb. https://collections.library.yale.edu/catalog/32319734.

APA, 6th edition

Asch, Sholem, 1880-1957. (["Box 13, folder 148"])(1934 Feb)[Speech in PEN News]. https://collections.library.yale.edu/catalog/32319734.