Cite

Pregel', Sofiia

MLA

Filippov, Boris, 1905-1991. Pregel', Sofiia. Box 5, folder 172. 1962-67. https://collections.library.yale.edu/catalog/16537940.

APA, 6th edition

Filippov, Boris, 1905-1991. (["Box 5, folder 172"])(1962-67)[Pregel', Sofiia]. https://collections.library.yale.edu/catalog/16537940.