MLA

Clark, Eleanor, 1913-1996. Rukeyser, Muriel. Box 32, folder 464-466. 1933-1970. https://collections.library.yale.edu/catalog/17123998.

APA, 6th edition

Clark, Eleanor, 1913-1996. (["Box 32, folder 464-466"])(1933-1970)[Rukeyser, Muriel]. https://collections.library.yale.edu/catalog/17123998.