MLA

Herbst, Josephine, 1892-1969. New Republic. Box 20. 1931-1966, undated. https://collections.library.yale.edu/catalog/10607127.

APA, 6th edition

Herbst, Josephine, 1892-1969. (["Box 20"])(1931-1966, undated)[New Republic]. https://collections.library.yale.edu/catalog/10607127.