MLA

Gulʹ, Roman, 1896-1986. Odarchenko, IUrii. Box 50, folder 1265. n.d.. https://collections.library.yale.edu/catalog/17277461.

APA, 6th edition

Gulʹ, Roman, 1896-1986. (["Box 50, folder 1265"])(n.d.)[Odarchenko, IUrii]. https://collections.library.yale.edu/catalog/17277461.