MLA

Argus Book Shop (Chicago, Ill.). Mann, Thomas. Box 8, folder 288. 1940 Aug 1. https://collections.library.yale.edu/catalog/17411919.

APA, 6th edition

Argus Book Shop (Chicago, Ill.). (["Box 8, folder 288"])(1940 Aug 1)[Mann, Thomas]. https://collections.library.yale.edu/catalog/17411919.