MLA

Berberova, N. (Nina), 1901-1993. Kochevitsky, George A.. Box 12, folder 316. 1967-89, n.d.. https://collections.library.yale.edu/catalog/16688013.

APA, 6th edition

Berberova, N. (Nina), 1901-1993. (["Box 12, folder 316"])(1967-89, n.d.)[Kochevitsky, George A.]. https://collections.library.yale.edu/catalog/16688013.