MLA

Gulʹ, Roman, 1896-1986. Filippov, Elagin, unidentified, Kovalenko, Bushman, unidentified, Rybinskii, Kasim, Anstei, Menchukov, Tverskoi, Nartsissov. Box 83, folder 2002. 1949. https://collections.library.yale.edu/catalog/16308540.

APA, 6th edition

Gulʹ, Roman, 1896-1986. (["Box 83, folder 2002"])(1949)[Filippov, Elagin, unidentified, Kovalenko, Bushman, unidentified, Rybinskii, Kasim, Anstei, Menchukov, Tverskoi, Nartsissov]. https://collections.library.yale.edu/catalog/16308540.