MLA

Berberova, N. (Nina), 1901-1993. Vanity Fair. Box 21, folder 598. 1991. https://collections.library.yale.edu/catalog/16688044.

APA, 6th edition

Berberova, N. (Nina), 1901-1993. (["Box 21, folder 598"])(1991)[Vanity Fair]. https://collections.library.yale.edu/catalog/16688044.