MLA

Veĭnbaum, M. E. (Mark Efimovich), 1890-1973. Muratov, Pavel. Box 5, folder 236. 1926-27. https://collections.library.yale.edu/catalog/2056767.

APA, 6th edition

Veĭnbaum, M. E. (Mark Efimovich), 1890-1973. (["Box 5, folder 236"])(1926-27)[Muratov, Pavel]. https://collections.library.yale.edu/catalog/2056767.