MLA

Lunt︠s︡, Lev, 1901-1924. Lunts, Evgeniia. Box 1, folder 14. 1923 Sep 30, n.d. https://collections.library.yale.edu/catalog/16474516.

APA, 6th edition

Lunt︠s︡, Lev, 1901-1924. (["Box 1, folder 14"])(1923 Sep 30, n.d)[Lunts, Evgeniia]. https://collections.library.yale.edu/catalog/16474516.