MLA

Herbst, Josephine, 1892-1969. "Coward - McCann". Box 4. 1928-1966, undated. https://collections.library.yale.edu/catalog/32267855.

APA, 6th edition

Herbst, Josephine, 1892-1969. (["Box 4"])(1928-1966, undated)["Coward - McCann"]. https://collections.library.yale.edu/catalog/32267855.