MLA

Berberova, N. (Nina), 1901-1993. Berberova, Asya. Box 4, folder 62. 1939-66, n.d.. https://collections.library.yale.edu/catalog/16687984.

APA, 6th edition

Berberova, N. (Nina), 1901-1993. (["Box 4, folder 62"])(1939-66, n.d.)[Berberova, Asya]. https://collections.library.yale.edu/catalog/16687984.