MLA

Rudge, Olga, 1895-1996. Correspondence. Box 22, folder 603-04. 1942 Jan. https://collections.library.yale.edu/catalog/17091452.

APA, 6th edition

Rudge, Olga, 1895-1996. (["Box 22, folder 603-04"])(1942 Jan)[Correspondence]. https://collections.library.yale.edu/catalog/17091452.