MLA

Gulʹ, Roman, 1896-1986. Pozdniakov, Vladimir Vasil'evich. Box 11, folder 269. 1948-54. https://collections.library.yale.edu/catalog/16456679.

APA, 6th edition

Gulʹ, Roman, 1896-1986. (["Box 11, folder 269"])(1948-54)[Pozdniakov, Vladimir Vasil'evich]. https://collections.library.yale.edu/catalog/16456679.