MLA

Berberova, N. (Nina), 1901-1993. Parents, grandparents, cousin. Box 53, folder 1180. 1913-2?. https://collections.library.yale.edu/catalog/10453943.

APA, 6th edition

Berberova, N. (Nina), 1901-1993. (["Box 53, folder 1180"])(1913-2?)[Parents, grandparents, cousin]. https://collections.library.yale.edu/catalog/10453943.