MLA

Herbst, Josephine, 1892-1969. Taggard, Genevieve. Box 23. 1920-1942, undated. https://collections.library.yale.edu/catalog/17173204.

APA, 6th edition

Herbst, Josephine, 1892-1969. (["Box 23"])(1920-1942, undated)[Taggard, Genevieve]. https://collections.library.yale.edu/catalog/17173204.