MLA

Berberova, N. (Nina), 1901-1993. Makeeva, Irina. Box 54, folder 1244. 1990. https://collections.library.yale.edu/catalog/10454462.

APA, 6th edition

Berberova, N. (Nina), 1901-1993. (["Box 54, folder 1244"])(1990)[Makeeva, Irina]. https://collections.library.yale.edu/catalog/10454462.