MLA

Stepun, Fedor, 1884-1965. Markov, V.. Box 21, folder 739. 1962-64. https://collections.library.yale.edu/catalog/17335488.

APA, 6th edition

Stepun, Fedor, 1884-1965. (["Box 21, folder 739"])(1962-64)[Markov, V.]. https://collections.library.yale.edu/catalog/17335488.