MLA

Berberova, N. (Nina), 1901-1993. Kerensky, Aleksandr Fyodorovich. Box 12, folder 291-295. 1945-65, n.d.. https://collections.library.yale.edu/catalog/16688005.

APA, 6th edition

Berberova, N. (Nina), 1901-1993. (["Box 12, folder 291-295"])(1945-65, n.d.)[Kerensky, Aleksandr Fyodorovich]. https://collections.library.yale.edu/catalog/16688005.