MLA

Rudge, Olga, 1895-1996. Correspondence. Box 22, folder 610. 1942 May. https://collections.library.yale.edu/catalog/17091453.

APA, 6th edition

Rudge, Olga, 1895-1996. (["Box 22, folder 610"])(1942 May)[Correspondence]. https://collections.library.yale.edu/catalog/17091453.