MLA

Argus Book Shop (Chicago, Ill.). Koenigsberg, Moses. Box 7, folder 246. 1940. https://collections.library.yale.edu/catalog/17411916.

APA, 6th edition

Argus Book Shop (Chicago, Ill.). (["Box 7, folder 246"])(1940)[Koenigsberg, Moses]. https://collections.library.yale.edu/catalog/17411916.