Efimov, Boris
MLA
Low, David, 1891-1963. Efimov, Boris. Box 9, folder 445. 1942-47. https://collections.library.yale.edu/catalog/16457735.
APA, 6th edition
Low, David, 1891-1963. (["Box 9, folder 445"])(1942-47)[Efimov, Boris]. https://collections.library.yale.edu/catalog/16457735.