Task, Sergei
MLA
Berberova, N. (Nina), 1901-1993. Task, Sergei. Box 54, folder 1251. 1981. https://collections.library.yale.edu/catalog/10454482.
APA, 6th edition
Berberova, N. (Nina), 1901-1993. (["Box 54, folder 1251"])(1981)[Task, Sergei]. https://collections.library.yale.edu/catalog/10454482.